In a small skillet add the balsamic vinegar and cook over medium heat until it reduced to less than half and thickened. Make sure you stir occasionally. It should only take about 5 to 10 minutes, depending on the amount you're reducing.
Take a toothpick and on it stick a bocconcini, a basil leaf and a cherry tomato. Repeat with remaining ingredients.
Season with salt and pepper.
Using a teaspoon drizzle some of the balsamic reduction onto each appetizer.
Please keep in mind that nutritional information is a rough estimate and can vary greatly based on products used.