Delicious vegan moussaka is a rich casserole with caramelized eggplant and a tomato-based lentil filling smothered in vegan béchamel, then baked until hot and bubbly!
Heat a large skillet over medium heat, then a little bit of olive oil. Sauté the onion and garlic until softened. Add the tomato paste and cook for 2 more minutes, stirring occasionally.