LENTIL AND AUBERGINE RAGU

2 tbsp olive oil • 1 small aubergine, cut into 1cm dice • 1 red onion, finely sliced • 2 garlic cloves, crushed • 2 tomatoes, diced • 180g dried tagliatelle • 250g Merchant Gourmet Tomatoey French Puy & Green Lentils • Small handful basil leaves