Through friends http://vporn.in.net/ veporn Meanwhile, heat 1 tbsp olive oil in a saucepan and add the onion and celery. Sauté until soft but not coloured. Add the garlic and cook for a further two minutes, then add the lentils and enough water to cover by about 5cm (2in). Bring to the boil then turn down the heat and simmer for about 20 minutes, or until the lentils are tender (they may need longer, depending on their age). Drain and immediately add the 4 tbsp extra-virgin oil, balsamic vinegar, lemon juice to taste, dill and seasoning.