Pick through the rajma, discarding any stones, place in a strainer, and rinse the dried beans.

Transfer the rinsed rajma, water, and baking soda in a large bowl and let soak for at least 6 hours, up to overnight.

Transfer the soaked rajma and the water to a large pot, stir in 2 teaspoons salt, cover, and bring to a boil.

Reduce the heat to medium low, keeping at an active simmer, and cook until the beans are cooked through and tender, 24 to 34 minutes.

Turn off the heat and let sit covered until ready to use.

Place the tomatoes in a blender or food processor and pulse until coarsely puréed. Alternatively, finely dice the tomatoes. Set aside.

In another large pot or Dutch oven, heat the ghee over medium heat.

When shimmering, add the crushed coriander, whole cumin, and hing, if using, and cook, stirring frequently until the spices turn a shade darker and smell toasty, 30 to 45 seconds.

Add the onions, poblano, jalapeno, and ½ teaspoon salt, and cook, stirring occasionally, until the vegetables have softened and the onions just start to turn light golden around the edges, 9 to 13 minutes.

Add the garlic and ginger, and continue to cook until fragrant and the ginger has softened, another 3 to 5 minutes.

Add the tomato paste and cook, stirring frequently, until it turns a shade darker and the ghee starts to separate from the vegetables, 2 to 4 minutes.

Add the taco masala and turmeric and cook, stirring frequently, for another 30 seconds to 1 minute.

Stir in the tomatoes and the remaining ½ teaspoon salt, cover, and cook, stirring occasionally, until the tomatoes start to thicken and lose their rawness, 8 to 10 minutes.

Add the cooked rajma and the cooking liquid, stir to combine, cover, reduce the heat to medium low, and simmer to let the flavors meld, 20 to 25 minutes.

If the chili is a little thick, you can thin with a couple splashes of water until you reach the desired consistency.

Taste and adjust salt, if necessary.

To serve, ladle the chili into individual bowls or serve over Mexican or jeera rice.

Garnish with yogurt or raita, red onion, cilantro, and other desired toppings.