Burgers:
1 peeled yam
3-4 chopped white mushrooms
1 peeled, chopped onion
Salt, pepper and coriander, to taste (and whatever other spices you like)
2 tablespoon chia seeds
2 tablespoons hemp seeds
1/4 cup sun-dried tomatoes
1/4 cup raisins

Toppings:
Sliced onions, tomatoes, avocado, nut cheese, lettuce, cilantro, ketchup, hummus (all optional)

Buns:
Swiss chard leaves or chickpea bread