1. Unlock and hire a blueberry hedgehog, which may give you tasks, including ordering a baked snapper.

2. Putting some small daisies in the garden can attract the arrival of blueberry hedgehogs and improve the chances of guests ordering snapper.

3. Wait for the guests to visit your restaurant, interact with them and complete their tasks. If they finish the task of blueberry hedgehog, they may order a baked snapper.

These steps can help you improve the chances of your guests ordering snapper, but there is no guarantee that they will definitely order this dish. You can attract more guests through constant attempts and efforts, thus improving the reputation and attraction of your restaurant in the game.