In a medium saucepan, combine 1 1/2 cups white vinegar 3 cups water,2 tablespoons coarse salt, 1 tablespoon sugar, 2-3 cloves garlic, 1/2 teaspoon dill seeds, 1/2 teaspoon mustard seeds, 1 teaspoon peppercorns, 1/2 teaspoon coriander seeds and 1/4 teaspoon red pepper flakes. Bring to a simmer over medium heat. Cook and stir until the sugar and salt are dissolved.