Tuna melts are by far my favorite greasy diner food, but alas as a person who is deeply vested in health and fitness I cannot indulge my love of this calorie rich food. Fear not health minded friends I have come up with a recipe that is probably 1 billionth of the fat and calories of this diner fabulous food. I use Greek yogurt instead of mayo and add walnuts to give it a nice crunch, this recipe is a good replacement for the not so heart friendly traditional melt. I use chunk light tuna in water (always dolphin friendly, don't want to hurt our cute little ocean buddies), about 1/4 cup plain Greek yogurt like Chobani 0%, one stalk celery, green onion (also know as chive or scallion), 2-3Tbsp chopped walnuts and a sprinkling of curry powder (I usually sprinkle and test until I get to the right amount). I think serving a tuna melt on anything but sour dough is a crime against food, punishable by eating bland food forever. I also like thin sliced tomato on mine under 3/4oz melted Tillamook cheddar cheese. This recipe is 475 calories, 36g of protein, and 15g of fat compared to a traditional tuna melt from a well known diner chain of 810 calories, 52g of fat and 43g of protein. You only sacrifice 7g of protein but save yourself a whopping 37g of fat and 365 calories. Yes I know, your welcome!