Instructions:

1. Cook the lentils and prepare the filling
   Step 1:

   In a saucepan, combine the rinsed lentils and water. Bring to a boil over medium heat, then reduce the heat and simmer for about 15 minutes or until the lentils are cooked and tender. Drain any excess water.
2. Prepare the samosa filling
   Step 2:

   In a frying pan, heat vegetable oil over medium heat. Add cumin seeds and sauté until they start to crackle. Add turmeric powder, coriander powder, red chili powder, garam masala, and salt. Mix well.
3. Add vegetables and cooked lentils
   Step 3:

   Add frozen green peas, chopped carrots, chopped bell pepper, chopped onion, and cooked lentils to the frying pan. Stir well and cook for another 5 minutes. Remove from heat and let the filling cool down.
4. Prepare and fill the samosas
   Step 4:

   Preheat the oven to 375°F (190°C). Place a sheet of filo pastry on a clean surface and brush it with melted butter. Fold the sheet in half lengthwise. Place a spoonful of the filling at one end of the strip. Fold the corner of the pastry over the filling to form a triangle. Continue folding the triangle until you reach the end of the strip. Repeat with the remaining filo pastry and filling.
5. Bake the samosas
   Step 5:

   Place the samosas on a baking tray lined with parchment paper. Brush the tops of the samosas with melted butter. Bake in the preheated oven for about 15-20 minutes or until golden brown and crispy. Remove from the oven and let them cool slightly before serving.