Recipe from KevBoy 
 
This is fast, easy, delicious.  (I adapted from Bon Appetit) 

TUNA STEAKS WITH GARLIC, TOMATOES, CAPERS AND BASIL 

2 c. chopped onions 
2 garlic cloves, minced 
1 lb plum tomatoes, coarsely chopped 
1 cup loosely packed fresh basil leaves, uncut 
1 1/2 tbs. capers, rinsed well, drained (I'm hoping this eliminates most of the sodium) 

4 ahi tuna steaks 

Heat small amt water or broth in large skillet.  Add onions, saute until tender, 
about 5 mins. Add garlic, saute until golden, about 3 mins.  
Stir in tomatoes, basil, and capers.  Simmer uncovered until mixture thickens, 
stirring occasionally, about 15 mins. 

Meanwhile, broil or grill the tuna steak in your usual fashion, only a bit more rare than usual.  
Add fish to skillet with tomato mixture and contine cooking about 2 minutes longer.  
Serve immediately.