Trout ravioli

Name: Trout ravioli (Mushroom duxelles)
Yield: Makes 4
Ingredients: 500 g mixed mushrooms; 100 ml whole milk; Thyme leaves; Olive oil; 4 king oyster mushroom; 4 button mushrooms; 12 centennial grapes; Kosher salt & pepper; 250 g 00 flour; 20 leaves tarragon, diced; Kosher salt & pepper; 50 ml olive oil; 1 lemon, zested; 200 g trout fillet, diced; 50 ml white wine; 100 ml double cream; 1 clove garlic, finely sliced; 30 g fresh horseradish, grated; 4 egg yolks; 2 shallots, finely sliced; 250 g semolina; 1 whole egg