Combine all of the the above ingredients into a pot and bring to a simmer over medium-high heat. Stir to make sure the sugar and salt have dissolved. Remove from the heat, let cool to room temperature and then place in the refrigerator until thoroughly chilled.
Submerge the heart into the brine weighing down with a dinner plate if necessary.
Cover and refrigerate for five days.
Remove the deer heart from the brine. Rinse the heart under cold water and completely dry off with paper-towels.