To make the avocado cream, blend the avocados, garlic, sour cream, some fresh basil leaves, and juice from half a lemon or lime in a mini food processor (or by hand).
Once you have blended the ingredients to a creamy consistency, add sea salt and pepper (to taste).
Spoon the avocado cream onto a platter.
Halve the grape tomatoes in the middle at a slant.
Rotate one of the halves to make a heart.
Stick the heart-shaped tomato onto a skewer, followed by a bocconcini and a folded basil leaf.
Repeat with the remaining skewers.
Top the tricolore skewers onto the avocado cream.
Drizzle with extra virgin olive oil.
Sprinkle with sea salt and lemon juice (or balsamic vinegar).
Serve immediately.