Add a splash of olive oil to a large saucepan over medium heat. Toss in the onion and garlic and sauté just to heat through, a minute or two. Pile in the tomatoes, paste, wine, oregano, bay leaves and salt. Bring to a simmer and slowly cook until all the flavours blend and deepen, about 20 minutes.
While the sauce is bubbling away, cook the pasta in lots of salty boiling water. Drain.
Fold the sauce and the spinach into the cooked pasta, stirring and allowing the heat to wilt the spinach. Serve and share.