Cook the pasta al dente according to the instructions on the packet. Catch 400 ml of the pasta water when draining.
In the meantime, cut the onions into fine half rings, cut or press the garlic according to taste and sauté in a pan. Add the spinach leaves and heat. Add the hummus and pour over the lemon juice and pasta water until a creamy sauce is formed. Stir in lemon zest and season with salt, pepper and other spices to taste. Cut the basil and stir in shortly before the end.