Salmon all'Arrabbiata - Serving Dumplings

Ingredients

• 1 tbsp olive oil
• 1 tbsp unsalted butter
• 4 skinless salmon fillets
• 4 garlic cloves (minced)
• 1 yellow onion (finely chopped)
• 2 tsp salt
• 2 tsp black pepper
• 1 tsp dried oregano
• 1 tsp dried sage
• 1 tsp sweet paprika
• 1 tsp fresh chili (chopped, or red chili flakes, more to taste)
• 1 anchovy fillet (in oil)
• 3 tbsp tomato paste
• ¼ cup chicken broth
• 1 ⅔ cups crushed tomatoes
• 3.5 ounces spinach
• 1.5 ounces grated Parmesan
• 2 tbsp chopped parsley