Drain jars well before filling. Cut guavas into thin slices; place in 4-qt. saucepan. Add water. Bring to boil. Reduce heat to low; cover and simmer 5 min. Thoroughly crush cooked guavas. Place three layers of damp cheesecloth or a jelly bag in large bowl.
Guava juice-wash 2 quarts of guavas, remove blossom end and cut into slices. Add water to cover, bring to a boil, and boil gently for 15 minutes. Strain through a jelly bag.
Place juice and pectin in a large stainless steal pot and bring to a quick boil. Add sugar and bring back to a boil and boil hard for 1 minute,, stirring constantly. Remove from heat, skim, ladle into hot, clean jars and seal. Process in a boiling water bath for 5 minutes. Guava juice-wash 2 quarts of guavas, remove blossom end and cut into slices.
The fat to carb ratio of guava fruit works perfectly for the popular Ketogenic diet. The fruit is very low in sugar, containing only 2.8 grams per serving, which is much lower than fruits like oranges, apples and bananas. One serving of guava fruit contains about 6.4 grams of fiber, which equates to 25% of your daily recommended intake.