Clean, wash and cut the white cabbage into strips. Peel carrots and cut into sticks Clean leek, wash and cut into rings. Pour the pineapple onto a sieve and collect the juice. Heat oil in a wok. Fry cabbage and carrots for about 5 minutes. Add the leek and half of the pineapple pieces to the cabbage.
Mix Sambal Oelek, soy sauce, 6 tablespoons pineapple juice, 6 tablespoons water and starch. Add to the cabbage and bring to the boil while stirring. Season to taste with salt and pepper. Arrange white cabbage wok vegetables in bowls. Coarsely chop the peanuts and sprinkle over the wok vegetables. Serve with rice