Add the olive oil to a large saucepan. Put on a medium heat on the hob, then add the garlic. Sizzle for 2 minutes.
Tip in the vegetable stock and bring to a simmer.
Add the pasta and spinach. Simmer for 10-12 minutes until the pasta is al dente. Stir occasionally.
Tip in the pesto and cheese. Stir well. Cook for another two minutes. Taste - add salt and pepper if needed - then serve.
Video
Notes
Depending on the size of your pan, you may need to add a little more water when you add the pasta. The water should be just above the top of the pasta.
Stir regularly as the pasta is cooking for best results.
Leftovers can be kept in the fridge for up to 5 days. Reheat thoroughly before eating.