Add ghee and cumin seeds in a pan on medium heat and let splutter for 30 seconds.
Roast onion, garlic, red pepper till soft, about 10-12 min
Blend canned whole peeled tomatoes (drained) and add to veggie mixture in pan, sauté for 3-4 min
Add peas, salt, 1 tbsp butter (optional), pav bhaji masala and mix together
Add boiled cauliflower and potato then blend with immersion blender or mash depending on desired texture
Add salt, add fresh lemon while blending (1/4-1/2 lemon), garnish with coriander and top with a little more lemon juice. Serve hot!