For Herbed Sandwich Spread, combine all ingredients together, season with salt, pepper and cayenne if desired.
For Patties, heat 1 tablespoon olive oil in a sauté pan and sauté mushrooms, sun-dried tomatoes and onion until tender. In a bowl, mix with a potato masher remaining ingredients leaving the mixture slightly chunky. Divide mixture into 6 patties, refrigerate until firm.
Heat remaining 3 tablespoons olive oil a skillet over medium heat. Cook patties until golden brown and warm, 15 to 20 minutes. (You can also do this in the oven at 350° for 20 minutes)
For Assembly, use 1 or 2 lettuce leaves for your “bun”. Top with sliced cucumber, hefty dollop of herbed sandwich spread, patty, avocado, and a generous mixture of carrots, beets and sprouts.