Ingredients: 12 oz (350g) button mushrooms 8 oz (225g) pack frozen peas 4 tablespoon vegetable oil 1½ cups curry sauce (page 20) 1 level teaspoon salt ½ teaspoon turmeric ½ teaspoon ground cummin ½ teaspoon chilli powder ½ teaspoon dried fenugreek ½ teaspoon garam masala…