3/4 cup olive or vegetable oil
1/4 cup cider vinegar
1/2 teaspoon salt
1/2 teaspoon dry mustard
1/4 teaspoon ground black pepper
1/4 teaspoon granulated sugar
1 clove garlic, peeled and cracked open (optional)

Put all ingredients in a small, screw-top jar. Cover and shake vigorously until well blended. Store in refrigerator. Remove garlic when dressing is flavored as desired. Makes 1 cup.