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1 tablespoon extra-virgin olive oil, plus more for brushing

1 small red onion, sliced

1 1 1/2-inch piece ginger, peeled and grated

Pinch of cayenne pepper

Juice of 1/2 lime

1 1/4 pounds (about 5 medium) tomatoes, chopped

1/4 cup chopped fresh cilantro

4 to 6 pieces naan bread or pita

Kosher salt

Plain Greek yogurt, for serving