Place the guavaberries, cinnamon, cloves, allspice, sugar, and water into a pot.
2. Cooking
Heat and simmer over low heat until the water has reduced, the berries are very soft and has turned into a jam with some liquid left (about an hour). Cooking time may vary, so keep an eye on it to prevent it from burning.Remove the pot from the heat, and let it cool to room temperature. If you are just making the jam, remove the spices, and chill before serving as a dessert.
3. Adding rum and steeping
Mix the jam (with all the spices) and the rum, and let it rest in the refrigerator for a week. Serve chilled.
Video
Notes
If you make the jam it will yield 4 servings, the drink will serve 8 shots.