1. Begin by rinsing the lentils under cold water, removing any debris or stones. Drain well.

2. In a medium saucepan, combine the rinsed lentils with 500 ml (about 2 cups) of water. Bring the mixture to a boil over high heat.

3. Once boiling, reduce the heat to low and let the lentils simmer for 20-25 minutes, or until they are tender but not mushy. Drain any excess water and set the cooked lentils aside.

4. In a large skillet, melt 2 tablespoons (28 g) of butter or margarine over medium heat. Add 2 tablespoons (12 g) of taco seasoning to the skillet and cook for 1-2 minutes, stirring constantly, until the spices are fragrant.

5. Add the cooked lentils to the skillet and stir well to coat them evenly with the seasoned butter. Cook for an additional 2-3 minutes to allow the flavors to meld.

6. Warm the tortillas by wrapping them in a damp paper towel and microwaving them on high for 20-30 seconds, or until they are soft and pliable.

7. To assemble the tacos, spoon the lentil mixture onto the center of each warm tortilla. Add your desired toppings, such as shredded lettuce, diced tomatoes, grated cheese, sour cream, or sliced avocado.

8. Serve the tacos immediately while warm, and enjoy your delicious and nutritious vegetarian creation.