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Add oil to a Dutch oven or large pot along with the diced onion and peppers. Cook over medium heat for 2-3 minutes, or until onion becomes tender. Add the minced garlic and ginger paste and continue sauteing for an additional 30-60 seconds, being careful not to brown them.
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Mix in the coriander, Garam masala, cumin, turmeric, sugar, and salt. Cook for 30 seconds, stirring constantly, or until the spices become fragrant.
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If using canned chickpeas, drain the liquid from the can and reserve 1 cup.
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Pour in the pureed tomatoes, chickpeas, and ½ cup of the reserved chickpea liquid. Stir everything together until well combined.
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Bring the ingredients to a boil and then reduce heat to medium-low. Simmer for 20-25 minutes, stirring every 5-10 minutes to prevent burning on the bottom of the pot.
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If desired, stir in the remaining reserved chickpea liquid to thin it out.
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Serve over a bed of basmati rice with pita bread and enjoy!