Heat grill.
In a bowl combine tomato, onion, jalapeno, lime and cilantro. Season
with salt and pepper. Set aside.
Brush tuna with oil. Grill fish about 5 minutes per side untilfish
flakes easily with a fork or until fish reaches desired doneness.
Remove from grill and set aside.
Heat beans in a saucepan over medium heat.
Meanwhile, wrap tortillas in a paper towel and microwave for 30 seconds,
or place on grill 15 seconds per side.
Cut tuna into 1-inch chunks.
In a bowl combine tuna with tomato mixture and avocado sprinkled
with any remaining lime juice. Layer each warm tortilla with 1/4 cup
black beans and a portion of tuna salad.
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