Make a Traditional Soubise Sauce Recipe for Serving With Meat

Gather the ingredients. The Spruce In a heavy-bottomed saucepan, melt the butter over medium heat. Add the onions and cook until they are soft and translucent. Make sure not to let them turn brown. The Spruce Transfer the cooked onions to a food processor. Purée briefly and then return them to the pot. The Spruce Whisk the béchamel into the puréed onions and bring the sauce to a simmer. The Spruce Add the tomato purée, if using, and gently mix over the heat until combined. The Spruce Serve right away with roasted meats or vegetables.