The only thing I can think of is too mix them with mashed veges and rice flour
For example in my book I have a Tofu and Vegetable Pattie recipe.
1 tablespoon mashe silken tofu
1 tablespoon mahed kuara
1 tablespoon mashed carrot
1 tablespoon pureed zuchini
2 teaspoons riceflour
Combine ingredients in small bowl; shape into two patties.
Heat small lightly oiled frying pa; cook patties, uncovered, about 3 mins each side or until heated through and browned lightly.
I have a Rissoles Recipe that makes about 30 mini patties
500g beef mince
1 small carrot, grated coarsely
1 small zucchini, grated coarsely
1/2 small brown onion, grated
1/2 cup stale breadcrumbs
1 tablespoon tomato sauce
2 teaspoons soy sauce
1 tablespoons olive oil
Combine all ingredients ina large bowl. Roll level tablespoons of the mixture into balls and cook in a lightly oiled frypan.