Peel and slice the peach in half, remove the pit. Dice into 1” chunks. Place the peach chunks in a saucepan with the sugar and water and bring to a boil, stirring to dissolve the sugar. Lower the temperature and simmer for 10-15 min until the mixture starts to thicken, stirring occasionally and mashing the peaches against the side of the pan. Turn off the heat and let cool for1-2 hours. Strain into a jar with a tight sealing lid, such as a mason jar, and keep refrigerated until use. Will keep 2 weeks in refrigerator