Is it OK to have tomato on tuna sandwich?

The answer is yes. Tomato is a common ingredient in tuna salad sandwiches, and it is generally considered to be a good match for the flavor of tuna. The tangy sweetness of the tomato can help to balance out the richness of the tuna, and it can also add a bit of moisture to the sandwich. Additionally, tomato is a good source of vitamins and minerals, including vitamin C, vitamin A, and potassium, making it a healthy choice for a sandwich.