This is a simple dressing that can be adjusted to taste by adding several flavours/ingredients.
1/2 cup light balsamic or wine vinegar
1 1/2 cups extra virgin olive oil (I often make it with only 1/2 cup of oil)
Salt to taste, (1/2 tsp. approximately)
1/2 tsp. freshly ground black pepper, adjust to taste
1 – 1 1/2 tsp. Dijon or whole grain mustard
1/4 tsp. sugar or sweetener
Other ingredients that can be added: Various herbs like parsley, chives, chervil, coriander, dill or mixed herbs, finely chopped or 1 heaped tsp. of Dijon or other mustard. or chilli flakes or crushed garlic or lemon/lime zest.