Photo: Tirithel · CC BY-SA 3.0
Leche Frita (Fried Milk Squares)
A dessert from northern Spain whose name means "fried milk". There is not one egg in it: starch alone sets the milk, and that decides everything. A starch gel is firm enough to take a knife when cold and loosens again when hot — so it can be chilled hard, cut into squares, and then fried for thirty seconds until the outside is crisp and the inside has gone back to being milk. Warm, it cannot be cut at all.
Ingredients
- The milk base (20cm square tin, 16 pieces)
- whole milk750 ml
- cornflour · less than this and it will not set90 g
- plain flour · rounds out the flavour30 g
- sugar110 g
- lemon zest · yellow part only; the white pith is bitter1 lemon
- cinnamon stick1
- butter · stirred in at the end20 g
- salt1 pinch
- For frying
- plain flour60 g
- eggs · beaten2
- oil · sunflower or olive500 ml
- To finish
- sugar4 tbsp
- ground cinnamon1 tbsp
Steps
- ⏲ 5 min
Take 150ml of the milk and keep it cold, and whisk the 90g cornflour and 30g flour into it. Tipped dry into hot milk, starch gelatinises on the outside and seals dry powder inside a lump.
- ⏲ 20 min
Heat the other 600ml with the sugar, lemon zest, cinnamon stick and salt to just below boiling, take it off and leave it 15 minutes to infuse. Lift out the zest and cinnamon.
- ⏲ 8 min
Stir the starch mixture again and pour it into the hot milk, whisking. Over medium-low heat, keep whisking and let it boil for 3 minutes after it starts. Starch swells between 60 and 75°C, but short of a real boil you get partial thickening and a floury taste.
- ⏲ 3 min
Off the heat, stir in the butter. It should be thick enough to fall off the spatula in one mass. If it runs, there is too little starch or it did not boil long enough.
- ⏲ 5 min
Pour it into a lined 20cm tin and level it 2cm thick, then press cling film onto the surface. That thickness is the variable here — thinner, and there is no soft middle left after frying.
- ⏲ 240 min
Chill at least 4 hours, ideally overnight. Lukewarm, a knife will not go through it. As it cools the starch chains realign and it firms further, so longer is easier to handle.
- ⏲ 10 min
Turn it out and cut 4 by 4 into 16 squares. Dipping the knife in hot water and wiping it between cuts gives clean faces.
- ⏲ 10 min
Heat the oil to 180°C. Flour each square thinly and dip it in the beaten egg. The coating has to stay thin — thick, and it colours before the inside is warm.
- ⏲ 1 min
Thirty seconds a side. Lift them out the moment they are gold. Left longer, the inside loosens completely and leaks through the coating. Three or four at a time, no more.
- ⏲ 5 min
Drain briefly, then roll in the sugar mixed with cinnamon. Serve them warm — the window in which the middle runs is short.
Tips & Variations
Variations
- Crema frita: made with yolks as a custard and fried the same way. Richer, but the egg takes over the setting and the starch behaviour is blurred.
- Leite frito: the Galician name. Many households replace some of the milk with cream for a softer middle.
- With anise or orange: orange zest instead of lemon, or a tablespoon of anise liqueur. It is an Easter-week dessert, and the flavouring is regional.
- Breadcrumbed: coating in breadcrumbs after the egg gives a thicker shell. It is sturdier, but the inside takes longer to loosen and the balance is harder to hit.
- The same structure as a croqueta: that one sets béchamel and goes savoury, this one goes sweet. In a Spanish bar they sit in the same display case.
Tips
- Having no egg in it is the point. The custards in crème brûlée and quiche are set by egg protein, and once set they do not go back. A starch gel is reversible — firm when cold, loose when hot. That is why this dessert is cut cold and eaten hot.
- Clafoutis is the same principle from the other side. There starch protects the egg so it does not curdle in the oven; here the egg is left out altogether and only the starch remains.
- Coxinha gives exactly the opposite instruction. Its dough "left to go cold cracks and cannot be shaped", so it must be handled warm. This has to be completely cold before a knife will pass through it. Same gelatinised starch mass: warm to shape one, cold to cut the other.
- It must boil once. As thickening puts it, starch swells between 60 and 75°C, and killing the heat there means it thins again as it cools. This is a mixture whose whole job is to set, so that step is not negotiable.
- 2cm thick. At 1cm the middle warms right through while frying and the whole thing slumps; at 3cm the outside is done while the centre is still cold.
- Thirty seconds means thirty seconds. The frying is not cooking anything — it is building a skin. The inside is already cooked, and left in the oil it loosens and bursts out.
- Not potato starch. The same guide notes that potato starch breaks down with prolonged cooking. Cornflour is the right one here.
- No acid in the gel. Use only the zest. Lemon juice cuts the starch chains and it will not set.
The basics behind this dish
- Serving Temperature: Why Some Dishes Wait and Some CannotWhy cold dishes need heavier seasoning, why rice and rice cake go stale fastest in the fridge of all places, and the dishes where letting the steam off is the point.
- Wrapping and Sealing: Why Dumplings BurstA dumpling bursts because of water in the filling, almost every time. How to deal with the filling first, when to seal with water and when with egg, why the pleats are structural, and how the cooking method decides the thickness of the wrapper.
- Eggs: Coagulation Temperatures and What They DecideWhite sets at 62°C, yolk at 68°C. Those two numbers explain scrambled eggs, boiled eggs, steamed custard and crème anglaise all at once.
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