1. Combine all the dressing ingredients in a jar with a tight-fitting lid and shake well to combine. Taste, and add more salt, pepper, or maple syrup as desired.

2. Lay a bed of lettuce down on a large serving platter or in individual salad bowls. To create a rainbow, start at one edge and top the greens with rows of the vegetables in the following order: tomatoes, orange peppers, yellow summer squash, blueberries, red cabbage, purple carrot. Leave a space between the yellow summer squash and the blueberries to allow the greens to peek through. Top with the toasted pumpkin seeds and serve with a drizzle of dressing. Alternately toss all the vegetables with the dressing in a large bowl and top with the pumpkin seeds just before serving.