Step 1

In a large deep frying pan, heat the oil over moderate heat. Add the onion and cook until starting to soften, about 3 minutes. Stir in the garlic and ginger and cook 1 minute longer. Add the beef and cook until no longer pink, about 3 minutes. Drain off any fat.

Step 2

Add the coriander, cumin, pepper, turmeric, cinnamon, and 1 teaspoon of the salt to the pan. Cook, stirring, for 1 minute. Stir in the potatoes, yogurt, and milk. Bring just to a boil. Cover the pan. Reduce the heat and simmer for 20 minutes. Uncover the pan and simmer for 5 minutes longer.

Step 3

Stir in the peas and the remaining 1/2 teaspoon salt. Simmer until the peas are just done, about 2 minutes. Stir in the lemon juice and cilantro.