Cook the pasta according to the packet instruction. For the last 2 minutes of the cooking time add the spinach.
Meanwhile, heat the oil in a frying pan. Add the garlic and chilli, then cook for a minute, stirring. Make sure that the garlic doesn’t burn!
Add the anchovies and the lemon juice, let it sizzle, then add a couple of spoonful of the cooking water of the pasta & spinach. Stir for a few seconds, until you get a thick sauce.
Drain the pasta & spinach and toss it in a mixing bowl with the anchovy sauce. Season to taste and serve with grated Parmesan, toasted pine nuts or chilli flakes, according to your liking and diet.