Lentil and Vegetable Ragout Korma

Name: Lentil and Vegetable Ragout (Korma)
Ingredients: 1 cup yellow lentils or yellow split peas; 1/2 teaspoon turmeric; 3 cups bottleneck squash, or 3 medium zucchini, cut into 1-inch pieces; 2 cups chopped tomatoes; 1 cup chopped onions; 1 tablespoon curry powder; 1/2 cup roasted peanuts or cashew nuts; Coarse salt; 2 tablespoons usli ghee (recipe follows) or light vegetable oil; 1 1/2 teaspoon cumin seeds; 1/2 teaspoons asafetida or minced garlic; 1 teaspoon crushed red pepper flakes; 1/2 cup coriander leaves; Lemon slices; 1 stick butter