3 cups red wine vinegar
3 tablespoons chopped fresh garlic (6 large cloves)
1 3/4 teaspoons salt
1 teaspoon sugar
1/2 teaspoon freshly ground black pepper
Olive oil, as needed

Whisk together all of the ingredients except the olive oil in a bowl (preferably one with a pouring spout). Select a 3- to 4-cup capacity bottle or jar with a screw-top lid (consider using an empty liquor bottle or water bottle; the lids screw on tight so there's no leaking). Pour the prepared vinegar mixture through a funnel into the bottle and store in the refrigerator.

When you're ready to use it, whisk together desired amounts of the vinegar base with good quality olive oil.