Wash and cut 4 medium zucchini in half lengthwise.Scoop out some of the flesh of the zucchini and chop it finely with a knife or in a food processor. Also, finely chop onionandgarlic.
Preheat the oven to 400°F or 200°C.In a large skillet, warm up 1 tablespoon extra virgin olive oil and gently fry 1 medium onion (chopped) for 3 minutes, then add 3 cloves garlic (grated) and chopped zucchini pulp and cook for 5 minutes.
Add 1 can (15 oz) lentils (drained and rinsed), ½ cup walnuts (chopped), 1 can (15 oz) crushed tomatoes, 2 tablespoons soy sauce, ½ teaspoon dried oregano, 1 teaspoon salt, and 2 twists black pepper.Simmer for 10 minutes on medium to low heat, stirring occasionally.
After 10 minutes, your filling should be rich, tasty, and thick. Taste and adjust for salt and spices.
Fill the zucchini shells with the lentil mixture and arrange them on a baking tray.Drizzle with olive oil and bake at 400°F or 200°C for about 25 minutes; then sprinkle them with grated parmesan, and bake for 5 more minutes until the cheese melts.
Garnish with freshly parsley or and a squeeze of lemon juice.
Nutrition information is an estimate for one zucchini boat out of eight.STORAGEMake ahead: this is an excellent recipe to make ahead as the zucchini boats keep well for a few days and also reheat well in the microwave. You can use them for meal prep and putlocks.Refrigerator: store them in the fridge for 3 - 4 days. Keep them on a serving plate wrapped in film or an airtight container.Reheat them in the microwave for about 2 minutes or in a preheated oven at 400°F or 200°C for about 10 minutes.Freezer: you can assemble and freeze the zucchini boats before baking them. They keep for about three months in the freezer. Thaw them in the refrigerator for a few hours, then bake.Frozen and thawed zucchini boats will have a different texture than fresh-baked zucchini. That's because freezing changes the structure of the zucchini, making it a little softer.