This concentrated mushroom-onion mixture is wonderful folded into scrambled eggs or omelets, stuffed under the skin of chicken, spooned onto mashed potatoes, or simply spread on toast. Squeezing all the moisture out of the chopped mushrooms is not essential, but it will help them brown more quickly in the pan. Mycologist and winemaker Michael Beug recommends using riesling with this recipe, especially with wild mushrooms like chanterelles.
Chop very fine or pulse in a food processor until they resemble oatmeal:
Squeeze about ½ cup of the mushrooms at a time in a thin cotton towel, wringing them very hard to extract their juices. The mushrooms will be in a solid lump if you have squeezed hard enough.
Melt in a medium skillet over medium-high heat until the foam subsides:
Add and cook briefly, until softened:
Add the mushrooms and cook, stirring often, until they have begun to brown and there is very little liquid left, 5 to 6 minutes. Stir in:
Cook until completely evaporated. Stir in:
Let cool. Refrigerate in a covered container for up to 10 days or freeze for up to 3 months.