Cook Lentils: In the large saucepan, simmer the lentils in three cups of water until tender, about 30-35 minutes. Drain the lentils and set aside.
Sauté Ingredients: While the lentils are cooking, heat olive oil in the same saucepan. Sauté onion and garlic until they're aromatic, then stir in cumin powder, salt, and pepper.
Add Spinach: Gradually stir in baby spinach to the saucepan until wilted, retaining some crunch and vibrant green colour.
Combine: Add the cooked lentils back to the saucepan and stir in fresh lemon juice. Cook for a few more minutes until everything is well combined.
Serve: Divide the mixture into four portions and serve warm. Enjoy your Mediterranean Spinach Lentils!