Preheat oven to 400 Fahrenheit.
Cut fennel and carrots into bite-size pieces (1-2"), then place fennel and carrots on separate sides of a baking sheet lined with parchment paper.
Fill a large salad bowl with arugula.
Dice your avocado into small 1/2 inch cubes and add them to the salad bowl.
Peel your grapefruit, cut it into bite-sized pieces, and place in the salad bowl.