Leek, chorizo and goat's cheese tortilla recipe

Ingredients

• 1 tbsp olive oil
• 80 g chorizo sausage, use the cooking type if you can, sliced
• 3 medium leeks, trimmed and sliced
• 500 g leftover (new or old) cooked potatoes, thickly sliced
• 3 or 4 sprigs fresh rosemary, needles roughly chopped
• 6 large eggs, beaten and seasoned with salt and pepper
• 100 g goat's cheese, or use mozzarella or another melting cheese