- Zest (of 1 lemon, grated)
- 3 tablespoons fresh lemon juice
- 1 teaspoon honey
- 1 small shallot, finely chopped
- 1 clove garlic, finely chopped
- 1 tablespoon fresh oregano or 2 teaspoons dried oregano
- 1/2 cup extra-virgin olive oil
- 1/2 teaspoon kosher salt
- 1/4 teaspoon black pepper
- 4 (6-8 ounce) tuna steaks
- 2 tomatoes, seeded (if desired) and diced
- 2 tablespoons capers, roughly chopped
- 1 cup arugula, roughly chopped
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