Slice each guava in half, and scoop out all of the flesh + seeds from within
Add the flesh + seeds to a food processor, along with the rest of the ingredients for the spread
Process until you reach a smooth consistency. Add a bit of water, as needed, to get a smooth blend.
For the grilled cheese sandwich
Heat the olive oil in a small pan, and add the onion. Sauté for 1-2 minutes, and then add the balsamic vinegar. Put the lid on, and allow to cook for another couple of minutes. Set aside
Layer 1 slice of bread with the date guava paste, 1 slice of cheese, and the cooked onions
Top with another slice of bread, and cook in a grill press for 3-4 minutes or until cheese melts, and the bread has browned
If you don't have a press, you can also cook on the skillet over low-medium heat for 2-4 minutes on each side, or until cheese melts and the bread has browned
Recipe Notes
1 serving of the date guava spread is the equivalent of 1 tablespoon Store the remaining spread in an airtight container in the fridge for up to one week...enjoy with toast, yogurt, or oatmeal!