1 tsp. salt
2 tbsp. wine vinegar
1/2 tsp. dry mustard
Pinch of black (or white) pepper
6 tbsp. olive oil
1 green onion, finely chopped

Put the salt in a bowl. Pour on the vinegar and mix well. Add the mustard and pepper, continue mixing. Add the oil and finally the green onion. Mix well. Can be made in a large quantity and stored in a jar or plastic container.