Cook the cauliflower. When cooked, put in food processor and run a few seconds to create cauli rice. Remove and set aside.
Put zucchini in food processor and run a few seconds to mince.
Combine zucchini and cauliflower in a large bowl. Add all the other ingredients and stir with a spoon until well mixed.
Scoop out the mixture into pancake-sized portions and put on an oiled large grill pan. The pan should be very hot before putting mixture on. Cook a few minutes on each side - until browned.
Serve with sour cream topping, if desire.