Fish Makhani - Fish in Creamy Gravy

Ingredients (24)

• 2 pounds (1 kilogram) fish fillets , any fish with firm white flesh, skin removed, cut into 2-inch pieces
• 1 lime , juiced
• Salt , to taste
• 1 teaspoon red chili powder , to taste
• 6 whole cloves
• 8 to 10 peppercorns
• 1 (1-inch) stick cinnamon
• 2 bay leaves
• 8 to 10 almonds
• 3 to 4 pods cardamom
• 1 cup plain yogurt , not sour
• 3 tablespoons vegetable oil , canola, or sunflower cooking oil
• 2 onions , chopped
• 2 teaspoons garlic paste
• 1 teaspoon ginger paste
• 2 teaspoons coriander
• 1 teaspoon cumin
• 1/4 teaspoon turmeric
• 1 ( 14-ounce /400-gram can ) chopped tomatoes , half of them pureed to a smooth paste in a food processor, the other half left in chunks
• 2 cups (500 milliliters) fish stock
• 2 tablespoons fenugreek leaves
• 3 tablespoons unsalted butter , softened
• Salt , to taste
• Coriander leaves , for garnish