Preheat the oven to 350 degrees
Cut the eggplants lengthwise in half. Scoop out some of the insides with a spoon to make a well. Save the inside pieces to sautee later. Place 2 eggplants on each baking sheet face up. Drizzle them with 2 tablespoons of olive oil spread evenly over all 4 and a pinch of salt and pepper on each. Bake for 15 minutes and remove from oven. Leave the oven on for later.
In a pan, heat 2 tbsp of oil on medium heat. Add the chopped onions and garlic and cook until soft (about 5 minutes).
Add all of the spices and stir for 1 minute
Add the lentils and and crushed tomatoes and simmer for 10 minutes, stirring occasionally.
Fill the eggplant boats with the lentil and vegetable mixture and place them back in the oven at 375 degrees for 10 more minutes.
Drizzle the eggplant boats with lemony garlic tahini dressing