Cauliflower Mascarpone Gratin
- 1 tablespoon softened butter
- 1 head cauliflower, separated into florets
- 1 container (8 ounces) Mascarpone cheese
- 3/4 cup half-and-half
- 1/2 cup grated Pecorino cheese, divided
- 1/2 cup grated Gruyere cheese, divided
- 1/4 cup chopped fresh sage
- 1 garlic clove, finely chopped
- 1/2 teaspoon salt
- 1/4 teaspoon ground nutmeg
- Freshly ground black pepper to taste