I've never even eaten one, so I had to look it up. It's ok to eat the whole gauva, seeds and all. Just rinse it off, cut off the ends, and munch away.
But my son likes guava juice, albeit the kind you buy in a can. I don't own a juicer or anything fancy like that. So I thought I'd try to make my own with basic kitchen equipment, a blender and strainer. This instructable documents what I did.
Apparently, the guava is more exotic then I realized. The spell-checker wants me to change guava to cave.
Step 1: Ingredients and Tools
Step 2: Slicing and Dicing
Slice them up by cutting off the black parts at the end.
Dice the guavas to fit in your blender.
Step 3: Blend
Fill up the blender about 2" from the top with water.
Add sugar to taste. I used 1/4 of a cup the first time which was fine for me. Kids like more sugar and seemed to like it a lot better if I used 1/2 cup.
Blend until it reaches a smooth consistency.
Step 4: Strain
Set up the strainer over your container and pour the blended mixture in. The mixture tends to clog the strainer very quickly. In order to help it through the strainer, stir with a wooden spoon. Almost all of it goes through except the seeds and a little of the pulp.
Repeat for all the juice in the blender.
Other people have told me they just let the seeds settle and then skim but I think I'd have to make the mixture a little thinner.