Step 1

In a large pot of boiling salted water, cook the lasagna noodles according to the directions on the package. Drain the noodles, rinse with cold water to cool, and set aside.

Step 2

Heat the olive oil in a large skillet over medium heat. Add the onion, zucchini, mushrooms, and garlic and sauté for about 5 minutes stirring occasionally, until slightly softened. Turn off the heat. Stir in the spinach, cover the skillet, and set aside to allow the spinach to wilt.

Step 3

Place the tofu, soy milk, lemon juice, basil, and salt in the bowl of a food processor and pulse to combine. Depending on the size of your food processor, you may need to push everything down with a spoon several times between pulses so all the tofu gets evenly crumbled. When you reach a crumbly ricotta­-style consistency, spoon the mixture into a large bowl. Stir in the sautéed vegetables and spinach until evenly combined.

Step 4

Preheat the oven to 350 degrees F. Spread 1 cup of the marinara sauce evenly across the bottom of a 9 × 13 ­inch baking dish. Follow this with a layer of 4 overlapping lasagna noodles, then a layer of half of the tofu mixture. Repeat with another 1½ cups of the marinara, another layer of noodles, and the second half of the tofu mixture. End with another 1½ cups of the marinara and a final layer of noodles, and spread the remaining 1 cup of marinara sauce on top, being sure to coat all the noodles.

Step 5

Bake for 45 minutes. Garnish with the basil leaves (if using).