Tuna and White Bean Salad

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1 tablespoon whole-grain mustard

2 lemons, 1 juiced and 1 cut into 4 wedges

Kosher salt and freshly ground black pepper

1 cup ripe cherry or grape tomatoes, halved

1/2 cup jarred pickled mushrooms

1/4 cup chopped pitted kalamata olives

1 tablespoon capers, drained

One 15-ounce can white beans, drained and rinsed

One 12-ounce can tuna packed in oil, drained

4 ribs celery, thinly sliced on an angle

5 cups mixed greens

Warm pita bread, for serving