Preheat the oven to 200 ̊C (400 ̊F) Gas 6.
Put the bell peppers on a sheet pan with high sides, sprinkle over the salt and drizzle over the olive oil. Bake in the preheated oven for 15 minutes.
Meanwhile, put the onion, garlic, passata/strained tomatoes, marjoram/oregano, tomato purée/paste, garlic salt and honey in a bowl and stir together to make a sauce.
To make the meatballs, finely chop the chorizo or use a food processor to grind it to a paste and mix it together with the minced/ground beef. Roll the minced meat mix into 12 evenly-sized meatballs.
After 15 minutes of cooking the (bell) peppers, add the sauce and the meatballs to the sheet pan. Cover with foil and bake for a further 25–30 minutes until the meatballs are just cooked and still moist. Serve.