Thoroughly drain the cooked lentils, then mash them with a fork or immersion blender until coarsely pureed.
Grate the carrot. Finely chop the onion and garlic.
In a bowl, combine the mashed lentils, grated carrot, chopped onion and garlic, rolled oats, flour, salt, pepper, and smoked paprika. Mix well to form a cohesive mixture. Let it rest for 10 minutes to allow the oats to absorb excess moisture.
Shape the mixture into four equally sized patties. Heat a little olive oil in a skillet over medium heat. Cook the patties for 3-4 minutes per side, or until golden brown and heated through.
Halve the hamburger buns and lightly toast the cut sides in a dry skillet or toaster.
Spread a little vegan mayonnaise on the bottom bun, top with a lettuce leaf, then the lentil patty. Add thinly sliced tomato, and finally the top bun.
Serve the assembled burger immediately. Serve with sweet potato fries or a fresh side salad.
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