Zucchini Carbonara with Parsnip ‘Pancetta’
Sea salt7 ounces (200g) whole-grain spaghetti4 tablespoons olive oil, divided2 parsnips—tops removed, peeled and cut into batons1 medium red onion, peeled and thinly sliced2 garlic cloves, peeled and minced½ cup (100g) sour cream2 egg yolks2 tablespoons grated Parmesan2 teaspoons lemon...