1/2 cup extra virgin olive oil
1/4 cup white wine or tarragon vinegar
2 Tbsp. Dijon mustard
1/4 tsp. salt
Fresh ground black pepper
2-3 large cloves of garlic, minced
Combine vinegar, mustard, salt, pepper and minced garlic. Beat in the olive oil gradually and whisk until it emulsifies. Or, put all in a blender at high speed.