1. Sauté onion in oil in a large frying pan until golden.
2. Add remaining vegetables and cook until soft. Add cold cuts and seasonings. Mix until combined.
3. Place one to two tablespoons filling in the middle of a wrapper and roll it up like a blintz.
4. Heat the oil in a deep frying pan and fry the rolls on all sides until golden and crispy. Drain on paper towels. Serve hot.