Place a large cast-iron or other heavy-bottomed frying pan over medium-high heat.
Once hot, add 1 tablespoon (15 ml / 0.5 fl oz) of oil and swirl to coat the bottom.
Carefully arrange half of the zucchini slices in a single layer in the pan.
Cook for about 2 minutes per side, until golden brown and tender.
Transfer the cooked zucchini to a serving plate.
Add the remaining 1 tablespoon (15 ml / 0.5 fl oz) of oil to the pan and repeat the process with the remaining zucchini slices.
Arrange all the cooked zucchini in a single layer on your serving dish. Lightly sprinkle with salt, pepper, ground roasted cumin, and red chili powder.
Spoon the warm tomato sauce over the center of the zucchini slices and serve immediately.
Slice your zucchini as uniformly as possible. Consistent thickness means every piece will cook evenly to tender perfection.