Penne with Courgettes and Lemon - Cooking like a Boss

800g ⁴⁄₅kg 1.76lb 28.2oz penne	boil	drain	add	season
24 tbsp 0.36 l 360 ml 72 tsp 1.52 cup 0.634 pint double cream
10 tbsp 0.15 l 150 ml 30 tsp 0.634 cup 0.264 pint lemon juice
1600g 1 ³⁄₅kg 3.53lb 56.4oz courgettes	grate coursely	stir fry
8 clove garlic
200g ¹⁄₅kg 0.441lb 7.05oz butter
16 tbsp 0.24 l 240 ml 48 tsp 1.01 cup 0.422 pint fresh parsley	chopped