This mixed salad combines cherry tomatoes, two kinds of greens, four additional vegetables, and omega-3-rich tuna. The olive oil from the jarred tuna infuses the dish with flavor.
Make the salad: Combine all of the salad ingredients in a large bowl.
Make the dressing: Whisk together mustard, vinegar, shallot, lemon zest and juice, water, salt, and pepper. Add oil in a slow, steady stream, whisking until dressing is emulsified.
Toss the salad with the dressing, and serve immediately.
Look for high-quality tuna packed in olive oil at specialty markets, some supermarkets, or online.