Traditional Mexican potato soup made with a simple tomato caldillo broth. Potatoes simmer in a base of blended tomatoes, onion, and garlic with cilantro and oregano. Comforting, simple, and ready in 30 minutes.
Blend the tomatoes, onion, and garlic until completely smooth.
Heat the oil in a pot over medium heat. Pour in the blended mixture (it will splatter). Cook for about 5 minutes, stirring occasionally, until it turns a deep red and the raw tomato smell is gone.
Add the cubed potatoes, broth or water, oregano, and cilantro sprig. Bring to a boil, then lower the heat and simmer for 20 minutes or until the potatoes are tender.
Taste and adjust salt. Serve hot with fresh cilantro, crumbled queso fresco, and warm tortillas.
Notas
Yukon Gold or waxy potatoes hold their shape best. Russets work but break apart more.
Don't skip frying the caldillo. This step develops all the flavor.
Use hot broth if possible to keep the temperature up.
Check potatoes at 15 minutes to avoid overcooking.
For a spicier soup, blend a jalapeño or serrano with the tomatoes.
Add a handful of fideo or small pasta for sopa de papa con fideo.
Stores in the fridge up to 3 days. Freezes well for up to 3 months.