This will vary significantly according to the size of your tomatoes, and how much tuna salad you stuff in each. I used 3 small to medium tomatoes and was able to fill the hollowed out one with 1 ½ scoops from an ice cream scoop, and used about 2 scoops for each star-shaped tomato. (see video) I still had tuna salad left over. If you want to make multiple stuffed tomatoes to feed a group of 4 or more, I advise making a double batch of tuna salad to ensure you have enough. Especially if you don’t include the apples in the salad – they add a lot of bulk!