11⁄2 lb (675 g) thick cut skinless white fish fillets, cut into strips
1-2 tbsp vegetable or sunflower oil
1 onion, coarsely chopped
2 garlic cloves, finely chopped
1 inch (2.5 cm) piece of fresh ginger, finely grated
large handful snow peas or sugar
snap peas, sliced into strips
sea salt and fresh
For the sweet and sour sauce
2 tbsp pineapple juice
1 tbsp white wine vinegar
1 tbsp tomato purée
1 tbsp granulated sugar
2 tsp soy sauce
1 tsp cornstarch
Directions
First, make the sauce by whisking together the pineapple juice, vinegar, tomato purée, sugar, soy sauce, and 1 tsp cornstarch. Set aside.
Put 1-2 tbsp cornstarch on a plate, and season with salt and pepper. Toss the fish in this seasoned mixture to coat.
In a wok, heat about half of the oil until hot, then add the fish. Stir fry for about 5 minutes until golden. Remove with a slotted spoon and set aside to keep warm. Carefully wipe out the wok with paper towels, and add a little more oil. When hot, add the onion and stir fry until it begins to soften, then add the garlic and ginger, and stir fry for a few minutes longer.
Pour in the sweet and sour sauce and let simmer for a few minutes, stirring constantly. Reduce the heat to medium, add the peas, and stir fry for 1 minute. Return the fish to the wok, quickly toss together to combine, and serve hot with rice.