The phrase "a pool of sauce" is correct and usable in written English.
It can be used to describe a quantity of sauce that has accumulated in a specific area, often in a cooking or dining context.
Example: "After simmering for hours, the stew created a rich, flavorful pool of sauce at the bottom of the pot."
Alternatives: "a puddle of sauce" or "a reservoir of sauce".
The disaster sat in a pool of sauce, which made the bottom crust soggy.
There is nothing in all of Italian food that is a greater abomination than pasta drowning in a pool of sauce.
Much as I love cream, as soon as I tasted a carbonara without it, I realised it was totally unnecessary: not only does it add an overbearing richness (as if eggs, cheese and fatty pork weren't enough), but dilutes the delicate flavour of the egg itself and leaves a pool of sauce at the bottom of the bowl when really all that's needed is something to coat the pasta.
For a more formal presentation, spoon a pool of sauce onto a warm dinner plate, place a breast half on top and moisten with a bit more sauce.
Chocolate caramel icebox cake is a simple compressed sphere, only a little denser than mousse, concealing pleasurable depths -- layer after layer of shortbread, chocolate-caramel mousse, molten caramel and meringue, swimming in a pool of caramel sauce and chocolate sauce.
Tiradito ($13), thin-sliced corvina in a pool of tangy sauce, begs for a drink.
Twin profiteroles filled with vanilla ice cream and sitting on a pool of chocolate sauce also scored points.
Even better was the house-made vanilla-orange bread pudding resting in a pool of caramel sauce with vanilla gelato on the side.
It came with a little tulip-shaped biscuit with a scoop of ice-cream in it and a pool of raspberry sauce.
The dates lay in a pool of wine sauce, fragrant with honey, clove, peppercorns and orange peel, next to a dab of mascarpone.
The desserts are lovely, especially the île flottante, an island of custard floating in a pool of vanilla sauce, strewn with berries—"my aunt Marie's way".
