Share a shot of tequila with a friend while making this. Add citrus peel to tequila remaining in bottle, and then add the Cointreau to taste. Keep refrigerated and serve in sherry glasses. Remove citrus peel if liqueur starts to become bitter. It can be served straight or on the rocks with a twist of orange peel. Take a bottle of this to the host of a dinner party instead of a bottle of wine. Nutritional analysis per servinq: 155 calories, trace of fat, 3 grams carbohydrates, O cholesterol, 1 milligram sodium.