1 pound yukon gold potatoes cold peeled cut into 1/2-inch cubes, and submerged in a bowl of water to prevent browning
Equipment
frying pan
blender
Directions
Combine the tomatoes, with their juices, and the onion, cilantro, garlic, chiles, and ginger in a blender jar. Puree, scraping the inside of the jar as needed, to make a reddish-green sauce.
Heat the oil in a large skillet over medium-high heat.
Add the cumin seeds and cook until they sizzle, turn a reddish brown, and smell nutty, 5 to 10 seconds. Immediately add the pureed tomato-onion sauce. Lower the heat to medium and cook, partially covered to contain some of the spattering, stirring occasionally, until the liquid evaporates and some of the oil starts to separate from the sauce, 15 to 20 minutes.
Stir in 1 cup water.
Drain the potatoes and add them. Cook, covered, stirring occasionally, until the potatoes are fork tender, 20 to 25 minutes.
Stir in the peas and cook, uncovered, until they are warmed through, 2 to 3 minutes.