Ingredients: 3/4 pound (360g) guyere, grated (about 3 cups) 1 cup (90g) grated Parmesan cheese 2/3 cup (160 ml) creme fraiche 1 Tablespoon Dijon Mustard 2 Large Egg yolks 1/4 Teaspoon grated nutmeg Salt & Pepper 2 Tablespoons (30g) Unsalted butter, at room temperature 8 …