Tofu'n'Roots Burger

Serving Suggestion
This burger has a mellow, slightly sweet flavor. I like to compliment this with a schmear of spicy chipotle dipping sauce on a toasted bun with a thick slice of red onion. I like a green side to go with. Streamed kale, broccoli or asparagus would work beautifully here.
Ingredients (makes 8-10 patties)
2 tbsp margarine
1 bulb (5-6oz) fennel, roughly chopped
1 medium (6-7oz) onion, roughly chopped
12 oz peeled and cubed sweet potatoes
2 cloves garlic, chopped
a pinch of salt
2 cups water
1 cup TVP granules
1 tsp cumin
18 oz extra firm tofu, pressed and drained)
1/2 cup vital wheat gluten flour
1 cup all purpose flour
oil for frying (optional)
Directions
Preheat oven to 350 degrees. Prep a cookie sheet by lining with parchment or silicone baking mat, or spraying with nonstick spray. In a frying pan or skillet, melt margarine over medium high heat. Add in fennel, onion, sweet potatoes and garlic. Sprinkle with a pinch of salt. Sauté until just beginning to brown, about 5 minutes. Add in 2 cups water, deglaze and bring to a boil. Reduce to a simmer, cover, simmer for 15 minutes. Stir in TVP granules and cumin. Remove from heat, cover, and let stand 10 minutes. Transfer to a large mixing bowl and crumble in tofu, and flours. Knead with your hands until very well incorporated. Let sit at least 20 minutes. Form into patties and bake uncovered at 350 for 30 minutes, or bake 20 minutes, and finish off with a pan fry for about 3 minutes per side.