Step 1 Heat a large saucepan over a medium heat. Lightly spray tofu with cooking oil. Cook, turning occasionally, for about 1-2 minutes or until browned. Transfer to a plate.

Step 2 Lightly spray pan with oil. Add onions to pan. Cook, stirring occasionally, for about 2 minutes or until soft.

Step 3 Add soup, stock, water, sambal or sauce, garlic and ginger. Bring to the boil. Add prawns and reduce heat to low. Simmer, uncovered, stirring occasionally, for about 5-6 minutes or until prawns curl and change colour. Stir in snow peas and fish sauce.

Step 4 Cook noodles following packet directions. Divide among large serving bowls.

Step 5 Ladle soup and prawns over noodles in bowls. Top with sprouts, coriander, chilli and tofu. Serve with lime wedges.