Add the orange zest, orange juice, sugar, apple cider vinegar, soy sauce, garlic, ginger, and sambal oelek to a medium-sized saucepan and set over low heat. Once the sugar is completely dissolved, turn the heat up to medium and bring the sauce to a simmer. Simmer for 5 minutes.
Orange Zest, 1 cup orange juice, ¼ cup granulated sugar, 2 tablespoons apple cider vinegar, 2 tablespoons low-sodium soy sauce, 2 cloves garlic, 1 tablespoon fresh ginger, 1 teaspoon sambal oelek