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Besides ingredients you also need a jar with a right-fitting lid. Gather supplies.
Add to jar 1 part vinegar or other acid such as lemon juice; 2 parts oil; 1/8 to 1/4 parts mustard; and salt, pepper, and sugar to taste.
Place lid tightly on jar.
Shake vigorously until salt is dissolved and oil is emulsified. Taste with a leaf of lettuce, and adjust seasoning as needed.