3 mushroom fontina panini Recipes

good sandwich bread (i prefer a whole grain country type loaf), shredded fontina cheese (more or less to taste), sliced mushrooms, chopped fresh sage leaf (or 3/4 tsp dried ), salt and pepper, butter (divided use )

unsalted butter, mixed mushrooms , brushed clean and sliced (mixed wild and cultivated mushrooms), chopped shallots, cognac, chopped fresh tarragon, salt, fresh ground black pepper, crusty country bread (each slice 1/2 inch thick ), very thinly sliced fontina cheese, baby spinach leaves