In small saucepan, place 1/2 cup water, peaches, honey, ginger, lemon zest, and pinch of salt. Bring to a boil, reduce heat to medium-low, and simmer for 5 minutes. Stir cornstarch or arrowroot powder into 1 Tbsp water until dissolved, and then stir into the peach mixture. Simmer for another 2 minutes, or until mixture thickens.