• a pinch of salt
• 2 tablespoons red wine vinegar
• 6 tablespoons olive oil
• freshly ground pepper
• 3 tablespoons finely chopped chives, parsley, or tarragon
• 1 onion, peeled and grated
• 2 gherkins, finely chopped
• 2 tablespoons capers

Dissolve the salt in the vinegar. Stir in the olive oil, pepper, herbs, onion, gherkins, and capers.