Whisk together the lemon juice, vinegar, balsamic, and salt in a large bowl. Add the oil in a slow stream, whisking until emulsified.

Put the greens and drained watermelon in a bowl. Add the pine nuts and the dressing and toss to coat. Sprinkle with cheese and pepper.

Note: do not add the watermelon until right before serving. Also, if you can't find the pea shoots you can use all arugula or part arugula and part spinach. You may want to double the dressing recipe so you have plenty of dressing in case you have left over salad which you haven't dressed.