To prepare this delicious jam recipe, wash the guavas thoroughly with water and chop into small pieces. Then put a deep-bottomed pan on medium flame and add water in it. Bring water to a boil and then add the chopped guavas in it and boil them too. When the guavas are boiled, drain the water and let them cool in a bowl.
Cut off the top stem and the bottom nub. Then cut into fourths. Place cut guavas in a large pot and cover with about 4 cups of water. Set to high and boil for 20-30 minutes or until the skins have softened. Once softened, lower heat to low. Using an immersion blender, mix guava and water into a puree.
If you have two cups of guava "meat," add two cups of granulated sugar (i.e. one-for-one). Add two tablespoons of pectin and the juice of two small limes (or one large Persian lime). Bring to rolling boil for 20 minutes, stirring continually.
Select guavas that are still firm. Wash, trim off top and bottom and cut in half. Then use a grapefruit spoon to scoop out the center with all seeds into 1 bowl and skin and meat into another bowl. Place the seedy bowl into a blender and add just a tad of water and pulse a couple times.