- 1/2 cup lemon juice
- 1/2 cup olive oil
- 2 1 1/4-inch-thick tuna steaks
- 1/4 cup spicy brown mustard
- 1 teaspoon mustard powder
- 3 tablespoons white sugar
- 2 tablespoons white wine vinegar
- 1/3 cup olive oil
- 3 tablespoons dried dill
- Combine the lemon juice with 1/2 cup olive oil in a sealable plastic bag; seal and shake. Add the tuna steaks and store in refrigerator to marinate while the grill preheats.
- Preheat an outdoor grill for high heat, and lightly oil the grate.
- Whisk the brown mustard, mustard powder, sugar, vinegar, and 1/3 cup olive oil together in a bowl; stir in the dill.
- Remove the tuna from the marinade and discard the marinade; cook the steaks on the preheated grill until the fish flakes easily with a fork, about 6 minutes per side. Drizzle the steaks with the mustard and dill sauce to serve.