Sofrito lentils

Name: Sofrito lentils
Ingredients: 1 tsp fennel or caraway seeds; 2 medium onions finely chopped; 3 carrots scrubbed or peeled and diced; 3 celery sticks, diced; 2 garlic cloves, sliced; few sprigs of thyme; 8 sage leaves or a sprig of rosemary (optional); 250g puy lentils; handful parsley leaves picked and roughly chopped; sea salt; black pepper; 1 heaped tsp Dijon mustard; 1/2 lemon juice; 3 tbsp extra virgin olive oil