Heat ½ cup oil in a pressure cooker. Add 2 sliced onions and fry until golden brown.
Add 4-5 garlic cloves (crushed).
Add 1 tsp cumin seeds and 1 tsp nigella seeds (kalonji).
Add 2 chopped tomatoes and cook until soft.
Add all the vegetables: potatoes, peas, cauliflower, spinach, fenugreek leaves (methi) and carrots.
Add spices: 1 tsp red chilli powder, 1 tsp crushed red chillies, ½ tsp turmeric powder, ½ tbsp coriander powder and salt to taste.
Mix well and pressure cook for 5 minutes without adding water.
After cooking, add juice of 2 lemons and mix gently.
Garnish: fresh coriander leaves, green chillies, and julienne-cut ginger; serve hot with roti or rice.