Vidalia Onion and Tomato Salad with Grilled Tuna

Ingredients

• 1 ½ tbsp olive oil
• ¼ cup lemon juice, fresh or bottled
• 2 tsp white wine vinegar
• 1 tsp dijon mustard
• ¼ tsp salt
• ⅛ tsp black pepper
• ¼ tsp thyme
• ¼ tsp oregano
• ½ lb fresh/frozen ahi (yellowfin) tuna steak
• ½ tsp olive oil
• ½ vidalia onion, thinly sliced
• vine-ripened tomatoes, cut into wedges
• 1 large head lettuce, washed, dried and torn into bite-size pieces