Step 1
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3
Place a casserole dish on low heat with the olive oil. Put in the garlic, red and green peppers and onion, and season with a generous pinch of black pepper. Fry gently together for 10 mins, stirring regularly, or until the vegetables are just starting to soften. Add the carrot, potato, and celery and fry gently for a further 10 mins, stirring regularly.