5 tspkasuri methi (fenugreek leaves), 1 tbsp plus 2 tsp; or 1 tbsp fenugreek seeds
2whole dried chiles de arbol
1 piecebrown cardamom pod, or 1 green cardamom pod
1whole clove
1 tbspgaram masala
1 tbspDiamond Crystal kosher salt
1 canwhole fire-roasted tomatoes with their juices, 28 oz (800 g)
1 ozraw cashews, about 12 to 15
1 ¼ cupswater, divided
2 tbspcanola oil or other neutral oil
1medium white onion, peeled and cut into 1/2-inch dice
¼ tspbaking soda
1 piecefresh ginger, 1-inch piece (1/2 oz; 14 g), peeled and thinly sliced
4 clovesgarlic, medium, smashed and roughly chopped
½ cupheavy cream, plus more for drizzling
4 tbspunsalted butter, cut into 4 pieces
warm long-grain rice, for serving