Squash, Sage, and Gruyère Frittata | culture: the word on cheese

Ingredients

• 1 summer squash (roughly grated)
• 1 zucchini (roughly grated)
• 1 tablespoon salt
• 2 tablespoons unsalted butter
• 1 yellow onion (thinly sliced)
• 2 garlic cloves (minced)
• 12 large eggs
• 1/2 cup heavy cream
• 2 cups roughly grated
• 12- month Gruyère
• 1/4 cup sage (finely chopped)
• 1/4 teaspoon red pepper flakes
• 1 lemon (zested)