Nicoise Salad with Grilled Tuna

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1 medium red onion, diced

4 fresh tuna steaks, about 6 ounces each

1 tablespoon pure olive oil

Kosher salt and freshly ground black pepper to taste

2 cups arugula, washed and dried

1-1/4 cups basil vinaigrette (recipe follows)

6 ounces cooked green beans

1-1/2 cups marinated baby artichokes, drained

8 ounces small red potatoes, diced and cooked

1 pound vine-ripened tomatoes, cored and diced

1 large fennel bulb, very thinly sliced

BASIL VINAIGRETTE

1 tablespoon Dijon mustard

2 tablespoons white wine vinegar

1/2 teaspoon kosher salt

Freshly ground black pepper

1/4 cup prepared basil oil

3/4 cup extra-virgin olive oil