
Whisk together the dressing ingredients and set aside.
Preheat your grill or grill pan to medium-high heat and brush the grates with oil. Grill the plums for 2-3 minutes or until grill marks appear. Flip and grill another 2-3 minutes. Set aside.
Assemble the salad with the arugula, goat cheese, mint, basil, red onion, grilled plum slices, and dressing. Season with salt and pepper as needed.