Grilled Tuna With Pineapple

• 475 milligrams sodium
• 100 milligrams cholesterol
• 2 grams fat
• 1 1/2 salt (inches thick)
• 1 from two limes approximately
• 525 gr tuna steaks
• 240 ml pineapple juice
• 130 gr steaks
• 120 ml vinegar (white)
• 120 ml tomato ketchup