Step 1

Remove the peel and cut the onion in large chunks. Add to the container of a high speed blender such as a Vitamix, along with the vinegar, sugar, mustard, salt and pepper. Blend until well pureed.

Step 2

Scrape down the sides of the container, and then, while the machine is running, slowly drizzle in the oil through a hole in the top. The dressing will become thick and creamy.

Step 3

Taste to adjust any of the seasonings. Keep refrigerated until needed. Note: this recipe makes more than you'll need for this salad, keep the leftover in the fridge and plan to use within 2 weeks.

Step 4

Put the lettuce in a large salad bowl and add each of the other ingredients. If you'd like to do a composed salad you can arrange them attractively in little piles around the lettuce, otherwise just dump them all in.

Step 5

Lightly dress and then toss the salad. Serve more dressing on the side.