3 egg yolks
1 tablespoon wine vinegar or lemon juice (more drops as needed)
1/2 teaspoon salt
1/4 teaspoon dry or prepared mustard
1 1/2 - 2 1/4 cups of olive oil, salad oil or a mixture of each. If the oil is cold, heat it to tepid; and if you are a novice, use the minimum amount
2 tablespoons boiling water
Warm the bowl in hot water; dry it. Add the egg yolks and beat for 1 to 2 minutes until they are thick and sticky.