Beetroot, red onion and black lentils with dill-sour cream recipe

Make the sour cream dressing by mixing 150g sour cream, 1 tbsp double cream, 1 tbsp extra-virgin olive oil, ½ tbsp white balsamic vinegar, 1 tsp Dijon mustard and 2 tbsp chopped dill together with some seasoning. Taste to see whether you want to make any adjustments (more balsamic vinegar, more double cream or more seasoning).