Recipe adapted from Aran Goyoaga and her blog, Cannelle et Vanille.
In a large bowl, toss together fennel, beans, olives, radishes, scallions, parsley, and oregano. In a medium skillet, heat 1 tablespoon oil over medium-high. Cook shrimp until opaque throughout, about 4 minutes, flipping once. Add shrimp to fennel mixture.
In a small bowl, whisk together 1/4 cup oil, lemon juice, mustard, and 1 teaspoon salt. Pour over salad and toss to combine. Serve in glasses, if desired.