Carrot tops are grassy and delicious, but their flavor can vary. Taste them to see if they are more bitter or sweet. Trim the tops, then stem and wash them so you are left with 3/4 cup of the more tender parts. The brown sugar on the carrots and the honey in the pesto are there to offset and balance the basil and carrot tops. This is what I call a "nose to tail" vegetable preparation. This makes a great appetizer or snack.