Gnocchi with Lemony Sage Brown Butter Sauce

Bahan-bahan (4 porsi)

• 1 batch 20-Minute Ricotta Gnocchi
• 8 tablespoons unsalted butter
• 20 large fresh sage leaves
• 1/4 teaspoon crushed red pepper flakes
• 1 small fresh lemon
• freshly-grated Parmesan cheese
• fine sea salt and freshly-cracked black pepper, to taste