Crispy Spiced Lamb and Yogurt Pasta

Name: Crispy Spiced Lamb and Yogurt Pasta
Ingredients: 4 tablespoons olive oil, divided; 1 large yellow onion, halved and thinly sliced; kosher salt and freshly ground black pepper; 1 1/2 teaspoons ground cumin; 1 1/2 teaspoons paprika (smoked or regular); 3/4 teaspoon cinnamon; 1/2 teaspoon Aleppo pepper; 1 pound ground lamb; 1 tablespoon tomato paste; 1/3 cup pine nuts; 1/4 cup raisins; 1 pound pasta (conchiglie or medium shells); 1 1/2 cups frozen peas; 2 cups Greek yogurt (2% or full-fat recommended); Finely grated zest + juice from 1 small lemon; 1/2 cup chopped parsley