For the sauce: In a blender, combine the quartered tomatoes, onion, garlic, water, pinch of cumin, salt, and pepper. Blend. Set aside.
In a pot, heat oil and add the finely chopped onion. Cook for about 3 minutes over medium-high heat.
Add the ground meat and, using a wooden spoon, break it apart thoroughly, ensuring no large chunks form as it cooks.
Season with salt and pepper and cook until it changes color.
Incorporate the diced potato and carrot. Mix well and cook over medium heat for around 5 minutes, stirring occasionally.
Pour in the sauce, add the peas, bay leaf, and oregano, then cover the pot.
Cook for 15 to 20 minutes or until the vegetables are cooked and the meat is thoroughly done. Adjust the seasoning if needed.
Remove the bay leaf before serving.