I'm thinking this sounds really good if you like eggplant. If you grow a garden this could also be very economical.

Vegan Eggplant Burger – Vegalicious Recipes
Yield: 8-10 burgers

Vegan Eggplant Burger

Ingredients:

3 eggplants, cut in small cubes
6 green onions, sliced
3 cloves garlic, sliced
1/4 cup nutritional yeast
1 & 1/2 cups dried bread crumbs
1 teaspoon sambal oelek ( I'd switch out with some other hot chilies if I could not locate this. Or from our garden)
1-2 teaspoons mustard
salt and pepper to taste
3 tablespoons oil (divided) for frying
1/2 cup water for frying

Directions:

Cut the eggplants in small cubes.
Heat 2 tablespoons oil in a very large frying pan and add the eggplant pieces to cook.
You want to cook the eggplant down to a mush, so from time to time add a bit of water to help the cooking process. It will be cooked off in the end. Continue cooking the eggplant until it is no longer little cubes, but one big mass.
Put the eggplant mass in a large bowl.
Lightly saute the spring onions and garlic.
Add the garlic and onions to the eggplant mass and mix.
Add the nutritional yeast, mustard and sambal oelek.
Add in the bread crumbs and mix well.
Taste the mixture and season to taste with additional salt and pepper if needed.
Chill the mixture for half an hour before forming the patties.
Form the patties.
Heat the last tablespoon of oil in a frying pan.
Fry the patties 3-4 minutes on each side until golden brown.
We enjoyed these on a bun, with lettuce and tomatoes and sweet pickle chips.