Mumbai Masala Sandwich

• 4 White Bread Slices
• 1/2 tsp Cumin Seeds
• 2 Garlic Cloves
• 1 Onion medium, finely chopped
• 1/2 inch Ginger finely chopped
• 1/2 tsp Red Chilli Powder
• 1/4 tsp Turmeric Powder
• a pinch Fenugreek Powder
• 2 tsp Coriander Powder
• 1 Potato boiled, peeled and mashed
• 1/2 tsp Garam Masala Powder
• 1/4 tsp Dry Mango Powder
• 1/4 tsp Chaat Masala Powder
• little Coriander Leaves
• as required Butter
• as per taste Salt
• 2 tsp Oil

For the green chutney

• 1 cup Coriander Leaves chopped
• 1/2 cup Mint Leaves chopped
• 1 Garlic Clove
• 1 Green Chilli
• 1/2 tsp Cumin Powder
• 1/4 tsp Salt
• 2 tbsp Tamarind Water
• as required Water