Prepare the mixture: In a mixing bowl, combine 0.25 lb of minced beef, 1 chopped onion, 3 eggs, 1 tablespoon of chili, salt to taste, and pepper to taste. Mix all ingredients thoroughly until well combined. 2. Heat the pan: Place a frying pan or griddle over medium heat. Add a small amount of vegetable oil (about 1-2 tablespoons) and let it heat up for approximately 1 minute. 3. Cook the first side: Pour the prepared egg and beef mixture onto the hot pan, spreading it evenly. Immediately place one half of a baguette, cut lengthwise and open-faced, directly on top of the mixture. 4. Press and cook: Gently press down on the baguette with a spatula for 2 minutes. Cook for approximately 2-3 minutes, or until the egg mixture is mostly set and lightly browned on the bottom. 5. Flip and crisp: Carefully flip the baguette and cooked egg mixture over, so the bread side is now facing down on the pan. Continue to cook for another 1-2 minutes, pressing down lightly, until the baguette is lightly toasted and crispy. 6. Serve: Remove the Roti John from the pan. If desired, spread mayonnaise and/or sambal chili sauce on the cooked sandwich. Cut the Roti John into several small, individual portions. Serve immediately.