Pasta with Beetroot Sauce and Feta Cheese

Name: Pasta with Beetroot Sauce and Feta Cheese
Prep time: 15 min
Cook time: 40 min
Total time: 40 min
Yield: 2 portions
Ingredients: 15 g olive oil; 80 g brown onion; 150 g cooked beetroot; ½ tsp dried chilli flakes; 25 g freshly squeezed lemon juice; 25 g shelled walnuts; 2 tsp fine sea salt; 1000 g water; 150 g rigatoni pasta; 200 g feta cheese; 5 sprigs fresh dill; 10 halved walnuts