1/2 pound arugula (about 2 cups, packed)
2 cups watermelon, seeded and cut into 1” cubes
1/4-1/2 cup feta cheese, crumbled
1 avocado, cut into 1” cubes
¼ cup extra-virgin olive oil
1 small shallot, chopped (about 2 tablespoons)
2 tablespoons red wine vinegar
Hefty pinch of salt
Freshly ground black pepper, to taste