chicken brine recipe

Ingredients: 1 gallon (3.8 liters) water 3/4 cup kosher salt 3/4 cup sugar (white or brown) 1 tablespoon black peppercorns 1 tablespoon whole coriander seeds (optional) 1 tablespoon whole mustard seeds (optional) 5-6 cloves garlic, smashed 1 onion, quartered 1-2 sprigs fresh rosemary (or 1 tablespoon dried rosemary)