Grilled Tuna Salad Sandwiches with Lemon-Habanero Mayonnaise and Watercress

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3 cups fresh lemon juice

1/2 to 1 whole habanero chile, chopped (only use the whole if you like it hot)

1 teaspoon grated lemon zest

1 cup best-quality mayonnaise

Salt and freshly ground pepper

1 small red onion, finely diced

1 large stalk celery, finely diced

2 tablespoons chopped fresh flat-leaf parsley

4 (8-ounce) tuna steaks

Olive oil

8 slices hearty bread (Italian, French, ciabatta, or country white)

Watercress