Francis inspired me to make my own croquettes. I didn't have the exact ingredients so I altered the recipe. Instead of the ground beef and pork, I used leftover grilled salmon that I flaked up. The potato patties were a bit soft but held up surprisingly well during frying.
These were good but next time I'm going by the recipe and using ground pork and beef. I bet chopped up ham would be really good too or mixed veggies if you didn't want to use meat.