
Bagna cauda
A warm dip of garlic, anchovy and olive oil, often enriched with butter, that Piedmont serves over a flame with raw and cooked vegetables and bread.
A thin, pourable custard sauce of egg yolks, sugar and hot milk or cream, cooked gently until it coats a spoon and no further.

Crème anglaise is custard without the set. The same egg-and-milk thickening that makes a baked custard firm is used here in a smaller amount, so the sauce stays pourable. Wikipedia describes custard as a family running from a thin pouring sauce, crème anglaise, to thick pastry cream, and notes that in French cookery custard technically means only the egg-thickened form.
Egg proteins coagulate as the sauce heats, and that coagulation is what thickens it. The sauce also thickens a little more as it cools, which is why the cook stops it slightly thinner than the final texture.
Heat is the whole method. Valrhona puts the working range at 180 to 185 °F (82 to 84 °C), with constant stirring. Below the range the sauce has not thickened, and the account says it can still be fixed by checking the cooking temperature. Above 185 °F (84 °C) the lecithin in the yolks can clot and form lumps, so the cook must watch the thermometer and not the clock.
Wikipedia gives a general caution for custards: a temperature rise of 3 to 6 °C can overcook and curdle an egg custard, and excess heat causes syneresis, where the sauce weeps liquid. Stabilisers such as a little cornflour help to prevent curdling, according to the same source.
Valrhona's fixes are practical. Yolks mixed with sugar in advance are less heat-sensitive, and the account says not to blanch them. Lumps are whisked, strained or blended out. A sauce that is too thick but has not curdled is thinned with milk reheated to the same window. A sauce that has curdled is a different case, and the account's advice there is to add an extra yolk and start again.
Custard is an old family of egg-thickened dishes. Crème anglaise is the thin, pourable end of that family. Wikipedia notes that the name 'custard' traces through French and Italian words for a tart crust, and that custards appear in The Forme of Cury under names such as Crustardes and Creme Boylede.
Scaling: source batch only
Wikipedia names crème anglaise as the thin pouring end of the custard range and notes that in French cookery custard means the egg-thickened version. The place is a naming association, not a documented origin.
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Valrhona, L'École ValrhonaMethod · Safety
Crème anglaiseCook to 180 to 185 °F (82 to 84 °C) stirring constantly
Above 185 °F (84 °C) the yolk lecithin can clot
Mixing yolks with sugar three to four hours ahead; thinning with reheated milk; curdling fix
Cited in: A sauce that stays liquid; The temperature window; Fixing a sauce that goes wrong
WikipediaHistory · Method
CustardCustard family and crème anglaise as the pourable end
Cooking temperature and syneresis; cornflour as a stabiliser
The Forme of Cury custard dishes; name origin
Cited in: A sauce that stays liquid; The temperature window