Cook the pasta according to the packet instructions
While the pasta is cooking, add the tahini to a small jug or cup along with the soy sauce. Peel and finely chop the garlic clove and add. Cut the lemon in hald and juice the lemon, then add the juice of the lemon too. Add around 100 ml of water and mix together until the sauce has reached a smooth consistency (I use a hand blender)
Add the pine nuts to a dry pan on a medium/high heat. Roast on the pan for a few minutes unil they start to brown slighly and become fragrant. Shake the pan so the pine nuts don't burn on one side and cook for another 2 minutes. Remove them from the pan.
Chop the spinach up so its ready to add to the pasta.
Once the pasta is cooked and is even slightly al dente, rinse the pasta. Add back the the pot and coat with the sauce. Add the pine nuts, nutritional yeast and the spinach and cook on a medium heat for another minute or two until the spinach has wilted.
Serve in bowls with a little black pepper.