Fill a small saucepan with water and bring to a boil. Add the lentils and cook until soft, about 10 minutes. Strain and set aside.
In a medium skillet add the garlic and onion, drizzle with the olive oil and sprinkle with the salt. Bring to medium heat and cook to soften, about 7 minutes. Add the eggplant and stir to combine, cover with a lid and cook until softened, stirring occasionally, about 10 mins).
In a food processor add the panko breadcrumbs and pulse into a ground meal. Transfer to a bowl and keep aside. Then add the eggplant mixture to the food processor with the cooked lentils, nutritional yeast, lemon zest, lemon juice, tamari, tahini, miso, chili powder and pepper. Pulse to combine.
Add ¾ cup breadcrumbs to the food processor and pulse to combine. (The breadcrumbs will help to thicken the patties. Texture of the patty mixture should be moist, but you want it dry enough to handle with your hands and hold its shape. Add remaining 1/4 cup more panko breadcrumbs if needed).
Transfer lentil patty mixture to the fridge and let cool for 15-30 minutes (this will make it easier to mould with your hands). Mould the patties into round flat disks, about the size of your palm (the mixture should make 8 patties total). Place the patties on a wood cutting board.
Heat a frying pan with a generous drizzle of olive oil, cook the patties until deeply browned and very crisp on bottom side, about 3 minutes. Carefully turn and repeat on second side, adding more oil as needed to maintain a light coating around patties in a skillet. (Optional to also cook on the bbq either directly on the grill, or place the patties on sheet pan that's drizzled lightly with olive oil - I prefer the sheet pan approach for a crispier patty, flip and cook each side for 3 minutes or until crispy).
Serve these lentil patties sandwiches between burger buns and toppings of choice (I like it served with vegan mayo with pickled onions, kimchi or sauerkraut. It's also delicious served alongside vegan coleslaw!)