I divided this mixture into 4 good sized burgers and shape into..... (goodnessgreen.com)
4 — Using your hands, carefully roll and flatten your tuna mixture into 6, even (ish) sized burger patties and place onto your prepared baking tray. (betterwithcake.com)
Was delicious but I only made half the recipe and got 8 medium sized burgers. (bbcgoodfood.com)