4 grilled fontina cheese sandwich with mushrooms and Recipes

unsalted butter, cremini mushrooms, trimmed and chopped, salt, black pepper, dry white wine, chilled italian fontina , rind discarded and cheese coarsely grated (2 cups), chopped fresh flat-leaf parsley, very thin slices firm white sandwich bread, white-truffle oil (optional)

extra virgin olive oil, divided, red onion, thinly sliced, salt, fresh ground black pepper, white mushroom, sliced (about 3 cups, may use baby bella mushrooms if you like), italian parsley, chopped, sourdough bread (or a whole grain bread), dijon mustard, fontina cheese, grated (1/2 to 1 cup), unsalted butter, softened (or melted )

olive oil, onion, diced small, carrot, diced small, celery, diced small, minced garlic, tomato paste, whole tomatoes , crushed by hand and juice reserved, chicken stock, marjoram, salt, freshly cracked black pepper, balsamic vinegar, heavy cream, chopped fresh basil leaves, grated fontina cheese, grated sottocennere cheese , or other truffled cheese, white sandwich bread, very thin slices prosciutto, sliced crimini mushrooms, olive oil, divided