Croquettes and Duchess Potatoes
Cooking Skills: Potatoes 2
Chapter 1 · Croquettes and Duchess Potatoes
Skill goal
Make dry mash that holds its shape, then pipe, roll and coat it.
Shopping list for this chapter
The basics
Potatoes 1 taught you to make mash fluffy. This chapter needs the opposite: stiff, dry mash that holds a shape. The only difference is the liquid you leave out.
| Style | Mash | Shape | Finish |
|---|---|---|---|
| Duchess | Dry, with egg yolk and butter, no milk | Piped swirls | Baked until golden |
| Potato bites | Dry, with cheese and flour | Rolled balls | Baked |
| Croquettes | Dry, with yolk, chilled hard | Cylinders in a crumb coat | Fried, baked or air-fried |
| Nests | Duchess mash | Ring with a well | Baked with an egg |
- Floury potatoes only. Waxy ones are gluey and won't hold.
- Steam-dry until no more steam rises, then mash smooth.
- No milk. The yolk adds richness and binds.
- Chill croquettes hard before coating and cooking.
Try it
Level 1 · Start here
Duchess potatoes
Duchess potatoes are very dry mash enriched with egg yolk, piped into swirls and baked until the ridges are golden. They hold their shape because there is almost no liquid in them.
Ingredients (4 portions)
- 400 g floury potatoes (e.g. Maris Piper), peeled and cut into even chunks
- 1 tsp salt, for the water
- 20 g butter, plus a little melted butter for brushing
- 1 Lion-marked egg yolk
- 1 pinch nutmeg, salt and white pepper
- Boil the potatoes in salted water for 15 to 20 minutes until completely soft. Drain, then return to the dry hot pan for 2 to 3 minutes, shaking, to steam off every bit of moisture.
- Mash or rice them until perfectly smooth (no lumps will pipe). Beat in the butter, the yolk, nutmeg and seasoning. No milk. The mixture should be stiff enough to hold a spoon upright.
- Heat the oven to 200°C fan (220°C conventional, gas 7) and line a tray with baking paper.
- Spoon the mash into a piping bag with a large star nozzle (or a freezer bag with a corner cut off). Pipe 8 swirls about 6 cm wide onto the tray. Without a bag, drop heaped spoonfuls and ruffle the tops with a fork.
- Brush lightly with melted butter and bake for 15 to 20 minutes, until the ridges are golden. Serve at once.
Pipe while warm
Cold mash is stiff and hard to pipe. Pipe within 10 minutes of mixing, or reheat gently.
Level 1 · Quick
Cheesy potato bites
Rolled balls of mash with cheese and a little flour, baked until crisp on the outside. The easiest croquette-style snack.
Ingredients (3 portions)
- 300 g floury potatoes, peeled, cooked and mashed dry (about 250 g mash)
- 40 g mature Cheddar, finely grated
- 1 spring onion, finely sliced
- 1 tbsp plain flour, plus more for rolling
- 1 pinch salt and pepper
- 1 tsp olive oil
- Boil, drain, steam-dry and mash the potatoes as in the duchess recipe (no butter or milk). Let the mash cool for 10 minutes.
- Mix in the cheese, spring onion, flour and seasoning. It should be firm enough to roll; add flour a teaspoon at a time if sticky.
- Heat the oven to 200°C fan (220°C conventional, gas 7). With floured hands, roll into 12 balls and flatten slightly. Place on a lined tray and brush or spray with the oil.
- Bake for 20 to 25 minutes, turning once, until golden. Eat hot.
Level 2 · Crisp
Crumb-coated croquettes
The coating is flour, then egg, then breadcrumbs, and the secret is chilling them hard before cooking, so the soft middle doesn't burst the crust.
Ingredients (4 portions)
- 400 g floury potatoes, peeled and cut up
- 1 tsp salt, for the water
- 1 Lion-marked egg yolk
- 30 g parmesan, finely grated
- 1 tbsp chopped parsley
- 1 pinch nutmeg, salt and pepper
- 3 tbsp plain flour, for coating
- 1 Lion-marked egg, beaten
- 60 g fine dried breadcrumbs
- 150 ml sunflower oil, for shallow frying
- Boil, drain, steam-dry and mash the potatoes until smooth, then beat in the yolk, parmesan, parsley and seasoning. Spread on a plate to cool, then chill for at least 1 hour.
- Set out three shallow dishes: flour, beaten egg, breadcrumbs. With floured hands, shape the mash into 10 short cylinders about 6 cm long.
- Roll each in flour (shake off the excess), then dip in egg, then roll in breadcrumbs, pressing to cover completely. For a sturdier crust, repeat the egg and crumbs. Chill again for 15 minutes.
- To shallow-fry: heat the oil in a heavy pan over a medium heat to about 175°C (a breadcrumb sizzles at once and browns in about 30 seconds). Fry in batches for 3 to 4 minutes, turning, until golden. Drain on kitchen paper.
- To bake or air-fry: spray the croquettes with oil. Bake at 210°C fan for 20 to 25 minutes, or air-fry at 200°C for 12 to 15 minutes, turning once, until golden.
Hot oil
Hot oil: use a heavy pan filled to no more than a third, never leave it, and keep children and pets away. Dry the food so it doesn't spit. If the oil catches fire, turn off the heat and cover with a lid or fire blanket; never use water. Let the oil cool completely before moving it, and don't pour it down the sink. Don't use a deep chip pan.
Level 2 · Brunch
Potato nests with baked egg
Pipe or spoon a duchess ring on a tray, make a well in the middle, and bake an egg in it. A good use of the technique.
Ingredients (4 portions)
- 1 batch floury potatoes, cooked and mashed dry for duchess potatoes (recipe 1, without the butter brushing)
- 4 Lion-marked eggs
- 1 tsp melted butter
- 1 pinch salt and pepper
- 1 tbsp chopped chives
- Heat the oven to 200°C fan (220°C conventional, gas 7). Make the duchess mash and pipe or spoon 4 thick rings, about 10 cm across, on a lined tray, leaving a deep well in the middle of each. Brush with melted butter.
- Bake for 15 minutes, until the rims are starting to colour.
- Carefully crack an egg into each well. Bake for 8 to 10 minutes more, until the white is completely set. The yolk can stay soft, or bake longer for a firm yolk.
- Season and sprinkle with chives.
Cooked eggs
Use Lion-marked eggs, which the Food Standards Agency says are safe to eat lightly cooked, including for pregnant women, babies and older people. If the eggs are not Lion-marked, bake until the yolk is firm.
Experiments
Experiment
Mash dryness
How much liquid is too much?
- Make three small batches of duchess mash: dry, with 1 tablespoon of milk, and with 3 tablespoons.
- Pipe or shape each and bake.
Look for: The dry mash holds sharp ridges. The 1-tablespoon mash softens slightly. The wet mash slumps into a puddle.
Experiment
Yolk in or out
What does the egg do?
- Make duchess mash with and without the egg yolk, and bake both.
- Compare shape, colour and taste.
Look for: The yolk makes the mash richer, golden and firmer. Without it the swirls are paler and a little crumbly.
Experiment
Fried, baked or air-fried
Three ways to cook a croquette.
- Coat 9 croquettes. Shallow-fry three, bake three on a tray, and air-fry three.
- Compare crispness, colour and oil.
Look for: Frying is the crispest and richest, the air fryer is close with little oil, and the oven gives the paler, softer crust.
Experiment
Single or double coating
One coat or two?
- Coat some croquettes once and some twice (egg and crumbs repeated).
- Cook both.
Look for: Single-coated ones can leak or burst, the double coat is thicker and holds better.
Tasting notes
| What I tried | Method or amount | What I saw | What I thought | Will I do it again? |
|---|---|---|---|---|
| Duchess potatoes | ||||
| Cheesy potato bites | ||||
| Croquettes | ||||
| Potato nests | ||||
| Dry vs wet mash | ||||
| Yolk in or out | ||||
| Fried, baked, air-fried | ||||
| Single vs double coat |
Troubleshooting
| Problem | Likely cause | What to do |
|---|---|---|
| Swirls slump | Mash too wet | Steam-dry longer; skip the milk; add a little flour |
| Lumpy, hard to pipe | Under-mashed | Rice or sieve the mash |
| Croquettes burst in the oil | Not chilled, thin coat, or oil too cool | Chill hard; double coat; use 175°C |
| Crumbs fall off | Wet surface | Flour first, then egg, then crumbs; press on |
| Greasy croquettes | Oil not hot enough | Check the temperature; drain on paper |
| Burnt crumbs | Oil too hot | Lower the heat; aim for golden |
Food safety: egg, hot oil and storage
Raw egg and raw flour: the Food Standards Agency advises against eating or tasting uncooked flour or dough, because raw flour is not treated to kill bacteria such as E. coli. Wash your hands, the board and your tools after handling raw dough or raw egg, and use Lion-marked eggs. Cook everything thoroughly. Pregnant women, children under 5, people aged 65 and over, and anyone with a weakened immune system should be especially careful.Hot oil: use a heavy pan filled to no more than a third, never leave it, and keep children and pets away. Dry the food so it doesn't spit. If the oil catches fire, turn off the heat and cover with a lid or fire blanket; never use water. Let the oil cool completely before moving it, and don't pour it down the sink. Don't use a deep chip pan.
Go for gold. Starchy foods that are fried, roasted or baked at high temperatures form a chemical called acrylamide, which the Food Standards Agency says could raise cancer risk. Its advice is to cook to a golden yellow, not dark brown. A balanced diet matters more than any single food, so this is a nudge about colour, not a reason to avoid potatoes.
Raw potatoes: keep them somewhere cool, dark and dry (above about 6°C), not in the fridge and not in the light. The Food Standards Agency advises against keeping raw potatoes in the fridge if you will roast or fry them, because the cold raises the amount of acrylamide that forms when they brown. Cut away sprouts and any green patches generously; if a potato is green all over, or tastes bitter, throw it away.
Cooked potatoes and anything made from them: cool them quickly (spread out, within 1 to 2 hours), keep them covered in the fridge, and eat them within 2 days. Reheat until steaming hot all the way through, and only once. (This is the general chilled-leftovers advice relayed by local-authority food-safety pages; there is no potato-specific rule, but potatoes are starchy, so they get the same care as rice and pasta.) Uncooked coated croquettes can be frozen on a tray, then bagged, and cooked from frozen with a few minutes added.
Checkpoint: can you do this now?
- I can mash potatoes dry enough to hold a shape.
- I can pipe duchess potatoes.
- I can coat and cook a croquette without it bursting.
- I know why I chill croquettes first.
- I can use hot oil safely.
Next chapter
Cooking Skills: Potatoes 2, chapter 2 is Potato Doughs and Breads: farls, lefse-style flatbreads, potato focaccia and rolls.