Finely chop the onion and garlic.
Dice the carrot, red pepper and celery.
In a large, heavy-based pot, heat the oil, then gently sauté the onion for 5 minutes until soft, then add the garlic, carrot, pepper and celery pieces.
Add the oregano or mixed herbs, then gently cook the vegetables over low heat for about 5 minutes.
Add the vegetable stock, chopped tomatoes and bring to a boil.
Add the pasta, then simmer, uncovered, for 10-12 minutes.
When the veggies are tender, add the drained lentils and kale, then cook for another 5 minutes.
Taste the soup and season to your liking.
Serve warm.