** refine onion/tomato/salt/cabbage amounts
Fry mustard and cumin in oil over medium-high heat until sizzling. Add ginger-garlic paste and fry until aromatic.
Add onion and fry until translucent.
Add tomato, salt, and turmeric. Fry until tomatoes are very soft.
Add chile powder and garam masala and fry until fragrant.
Add peas and saute briefly.
Add cabbage and stir to incorporate. Fry until cabbage is fully cooked.