Wash your vegetables. Using a mandolin or knife, thinly shred 1 white cabbage and 1/2 red cabbage. Place them in a large bowl.
Peel and julienne 1 English cucumber and finely dice green onion. Add both to the bowl.
In a separate small bowl use a fork to mix 4 tbsp sunflower oil, 1 1/2 tbsp vinegar and 1 1/2 tsp salt. Stir it into the salad to taste. You may need less depending on the size of your cabbages.