Grated zest of 2 medium oranges
Grated zest of 1 large lime
Grated zest of 1 large lemon
1/8 teaspoon ground cinnamon
1/8 teaspoon nutmeg, preferably freshly grated
1 section of a star anise pod, crushed
1/2 teaspoon dried lavender flowers
2 teaspoons minced ginger
1 one-and-a-half-inch piece vanilla bean, split
1/4 teaspoon citric acid (available at health food stores, or canning supply stores or kingarthurflour.com)
2 cups plus 2 tablespoons sugar
1 tablespoon (packed) light brown sugar
3/4 teaspoon caramel color powder, optional (available at kingarthurflour.com).