1.        Bring a large pot of water to a boil. Add salt and cook the spaghetti for 1 minute less than the recommended cooking time on the package.

2.         Save 1 cup of the pasta water.

3.         Heat the olive oil in a wok and add the onions. Cook for 2 minutes.

4.         Add garlic and cook for another 2 minutes.

5.         Add the mussels, cover with the lid and cook for 2-3 minutes until the mussels open.

6.         Αdd the cooked spaghetti to the opened mussels.

7.         Add the pesto sauce to the 1 cup of pasta water and stir.

8.         Heat for 1-2 minutes.

9.         Taste and season with salt and pepper.

10.       Serve immediately.