Zucchini and Green Pepper Sabzi

INGREDIENTS

• 3 tablespoons olive or corn oil
• Large pinch of ground asafetida
• 1/2 teaspoon whole cumin seeds
• 1/4 teaspoon whole brown mustard seeds
• 1 1/4 pounds zucchini, peeled and cut into 1 1/2-by-1/2-inch pieces
• 1 large green pepper (about 7 ounces), quartered lengthwise, seeded, and cut crosswise into 1/2-inch-thick slices
• 2 tablespoons plain yogurt
• 1 tablespoon ground coriander
• 1/2 to 1 teaspoon coarse salt
• 1/2 teaspoon chaat masala
• Juice from 1/2 lemon