Fennel Gratin

Ingredients (9)

• 2 large fennel bulbs about 3 pounds total, stalks and fronds removed (reserve a few fronds for garnish)
• 1 small yellow onion
• 1 1/2 tablespoons olive oil
• 1 1/2 teaspoons Kosher salt and freshly ground black pepper to taste
• 3/4 cup vegetable or chicken broth
• 2 ounce about 1/2 cup grated Gruyere cheese
• 1 ounce about 1/2 cup finely grated Parmesan cheese
• 1/3 cup Panko breadcrumbs or gluten free panko
• 1/8 teaspoon freshly ground nutmeg