Heat oil in a heavy bottom pan on medium-high heat. Add mustard seeds and cumin seeds and let them splutter. Add ginger, and saute for 30 seconds.
Add chopped tomato, turmeric powder and salt. Mix well and saute for 2 minutes.
Add chopped cabbage and green peas. Stir well so the spices mix with the cabbage.
Simmer until the cabbage & peas are cooked. Cover with a lid for 3-4 minutes and then cook without a lid for about 5 minutes. This will help any water released from the veggies to dry up.
Once cabbage and peas are cooked, turn off flame and garnish with chopped cilantro leaves. Enjoy Cabbage & Peas Stir Fry with roti and yogurt.