-1T white balsamic vinegar
-2T olive oil
-spoonful of honey
-fine sea salt
-freshly ground pepper
Add dressing ingredients to a bowl and squeeze in grapefruit and lime. Whisk ingredients and let sit.
Arrange baby arugula in a salad bowl. Toss with dressing. Slice Parmesan cheese over top.
You can also add slices of grapefruit over the top (from the other half you did not juice) or grilled steak.