Peel and dice the potatoes.

Place potatoes in a large pot and cover with salted water.

Bring to a boil and reduce heat to medium-low.

Simmer until potatoes are tender, about 20 minutes.

Drain the potatoes.

Heat vegetable oil over medium heat in a pan.

Mince the red onion and sauté until fragrant, about 2-3 minutes.

Dice the tomato and add to the pan.

Cook until the onion is softened and tomato is tender, about 5-10 minutes.

Stir in the boiled potatoes, garam masala, cayenne pepper, salt, and sugar.

Simmer, stirring frequently, until the flavors have blended, about 5 minutes.

Chop the fresh cilantro and stir into the potato mixture.

Cook for an additional minute and serve.