1 (8 ounce) container plain yogurt
1 clove garlic, mashed into a paste
2 tablespoons lemon juice
1 1/2 teaspoons garam masala
2 teaspoons white pepper
5 saffron threads
salt to taste
1 1/2 pounds skinless, boneless chicken, cut in 1-inch pieces
1 tablespoon vegetable oil
1 teaspoon cumin seed
1/4 cup heavy cream