To double a garlic sauce recipe, the chef simply multiplies the ingredients times two. He should keep in mind, however, that seasonings should be only about 1 1/2 times the original amount. More may be added for taste.
An easy garlic sauce recipe is made up of 1 garlic clove, 1 tablespoon of mayonnaise, 1 tablespoon of yogurt, 1 teaspoon of parsley or dill (depending on preference) and some freshly ground black pepper according to taste. All of the ingredients are mixed together to blend the flavors.
If the chef wants to double this recipe, he would use 2 tablespoons each of yogurt and mayonnaise. Remembering the rule for doubling seasonings, the doubled recipe would call for 1 1/2 garlic cloves, 1 1/2 teaspoons of parsley or dill and perhaps just a touch more of ground black pepper.
After mixing all of the ingredients, it is important for the chef to taste the garlic sauce for flavor. At that point, he may find it necessary to add a bit more of one or all of the seasonings. Additional garlic can create a sharper taste, and more parsley or dill can add a bit of freshness to the sauce.
If making a larger batch, fresh parsley or dill makes a better choice. The fresh herbs hold up longer and help to combat the inevitable garlic breath that comes with enjoying the sauce. The main thing to keep in mind is that it is easier to add flavor than to try to correct too much of one of the seasonings.