Swiss Chard and Lemon Ricotta Pasta

INGREDIENTS

• zest from 1/2 lemon
• 1/3 cup ricotta cheese
• 2 handfuls dried spaghetti noodles
• 3 cups raw Swiss chard, sliced (including the stems)
• 1/4 teaspoon salt, to taste
• Pinch dried red pepper flakes
• olive oil as needed
• 2 strips bacon, cut into 1/4" slices or lardons
• 1/2 large shallot, minced
• 2 tablespoons Parmesan cheese