Put the watermelon and onion rings into a large bowl. Roll the basil leaves together tightly. Take a scissor and cut the rolled basil in small slices over the watermelon. Toss the pine nuts and cheese into the bowl. Grind black pepper over.
DO NOT measure the oil, you will just be streaming it from the bottle.
Make the vinaigrette by putting the mustard into a small bowl. Put the bowl on a towel so it cannot move around, you need both hands. Have ready a whisk. Put the vinegar into the bowl, and whisk the vinegar and mustard together. All the while whisking, slowly pour the oil into the bowl, a drop or two at a time. You will see the mixture begin to turn into an emulsion. When the mixture has thickened, you can stop adding oil.
Pour the vinaigrette over the salad and toss. Refrigerate until ready to serve.
Notes
Quick notes Balsamic vinegar is preferred because it brings out the sweetness of the fruit. Other kinds of vinegar, except possibly raspberry or champagne, are not recommended. Variations You can use other onions for a different flavor. Vidalia onions are sweet, so they would be very nice. White onions are mild, so would also do well. Brown onions should probably be avoided as their pungent flavor would overtake the watermelon.If you want dairy-free, omit the parmesan.
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