Rub tuna with 1 tbsp olive oil, and sprinkle with salt/pepper evenly on both sides.
Grill, covered with grill lid, over medium-high heat 6-7 minutes on each side or to desired degree of doneness.
Brush bread slices with remaining 1 tbsp olive, and grill 1 minute on each or until golden
Flake tuna; combine with ground red pepper if desired, and next 4 ingredients. Spread tuna mixture evenly on 1side of each of 4 grilled bread slices; top with tomato and avocado slices.
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