Bengali Dimer Jhol

Name: Bengali Dimer Jhol
Ingredients: 4 tbsp oil; 500 grams potatoes Quartered and pre-boiled; 4 eggs boiled and peeled; 1 teaspoon Turmeric; 2 tablespoons butter; Half teaspoon black cumin seeds; 2 cloves; 1 green cardamom; 1 cinnamon stick 2 cms; 1 Red onion Pureed (approx 125g); 1 tablespoon ginger and garlic paste; 1 teaspoon ground coriander; 1 teaspoon chili powder adjust to taste; 1 large Tomato Pureed (approx 200g); 1 tablespoon kasoori methi; salt half a teaspoon; garam masala half a teaspoon; fresh coriander