Preheat oven to 400° F (200° C)
Place approximately 1 cup of marinara sauce into the bottom of a 13X9 baking dish to lightly coat. Set aside.
Sprinkle each side of the eggplant slices with salt. You can spread them out in a colander over the sink or on a baking rack with a pan underneath. Let them sit for 15-20 minutes This will release moisture, soften them and remove any bitterness.
When done, lightly rinse and pat dry with paper towels.
Grill the eggplant slices with neutral oil.
Dollop a heaping tbs of ricotta into one end of the eggplant, roll and place in the marinara-lined baking dish seam-side down.
Repeat with all eggplants and top with remaining marinara. Bake at 400°F for 15 minutes.