Cut the chorizo into small pieces. Peel onion and garlic and dice finely. Heat the oil in a pan with a high rim. Sauté the chorizo for 3-4 minutes, turning over. Remove the chorizo. Sauté onion and garlic in hot frying fat for 2-3 minutes, turning.
Add the pearl barley and sauté briefly.
Gradually add stock, stirring from time to time. Always add the next portion of liquid only after the pearl barley has absorbed the liquid. Cook for a total of approx. 25 minutes.
Wash the rosemary, shake dry, remove the needles and chop. Stir chorizo, rosemary and peas into the pearl barley for the last 5 minutes of the risotto cooking time. Season to taste with salt and pepper.