In a medium saucepan, set over medium heat, add the oil. When warm, add the onion, carrot, mushrooms and eggplant. Sprinkle with a few pinches of salt and cook until mostly softened, about 5 to 7 minutes, mixing regularly. Pour in the jar of marinara and give it a good mix. Bring to a simmer and give it a taste. Adjust the salt and spice level (I added a few pinches of crushed red pepper) to taste. This will kinda depend on the marinara you chose. Turn off the heat and set aside.

In a small bowl, mix together the ricotta, lemon zest, salt, Italian parsley and crushed red pepper.

Bring a pot of salted water to a boil. Boil the lasagna sheets according to the package, mine said about 8 minutes. Drain and rinse immediately with lukewarm water. This will wash the starch off of the sheets which is good because then they won’t stick.

Preheat the oven to 350 degrees F. Grab a large baking dish (I used a 9-inch braiser pot) and set it near you.

On a cutting board or clean counter, lay out the lasagna sheets. Add a few teaspoons of ricotta mixture to the lasagna sheet and spread it into an even layer. Top it with a teaspoon or two of the marinara mixture and then add a sprinkling of mozzarella cheese. Carefully roll up the lasagna sheet and transfer it to the baking dish. I added it spiraled side up. Repeat until you’ve worked your way through all of the lasagna sheets. A tip: to keep the roll-ups from unraveling, I put their seam against another lasagna roll-up.

Transfer to the oven to bake for about 20 minutes. At the 20 minute mark, top the lasagna roll-ups with about 1 cup of shredded mozzarella. Bake for an additional 5 minutes, until melted.

Serve immediately.