Make sure the peaches are ripe but still firm, (no mushy ones).. cut neatly in half and give a gentle twist to separate the two halves. Take out the pit. Grill with the flat side down first for a couple minutes to get some nice grill marks then flip over and put brown sugar and cinnamon in the hole left from the pit and on top. Put the lid back on and let them go a few minutes depending on the heat and how YOU like them. These are delicious!