To prepare a tuna, egg, potato, and Gruyère brick using Thermomix, you will need ingredients such as brick sheets, canned tuna, eggs, potatoes, grated Gruyère cheese, and spices. The recipe involves cooking the potatoes, preparing the filling, and folding the brick sheets.

You will primarily use the "Steam Cooking" function to cook the potatoes and the "Mixing" function to prepare the filling.

The preparation time will depend on the cooking steps for the potatoes and the preparation of the filling, but generally, it can take around 45 minutes to 1 hour.

Yes, the eggs should be hard-boiled. You can cook them in advance and peel them before adding them to the filling.

To prepare the filling, mix the crumbled tuna, chopped hard-boiled eggs, cooked and diced potatoes, grated Gruyère cheese, and spices in the Thermomix bowl.

Yes, you can lightly brush the brick sheets with melted butter or oil to make them crispy when cooked.

Place a portion of the filling in the center of a brick sheet, then fold the sides to cover the filling and roll it up to form a brick.

You can cook the bricks in a frying pan with a little oil over medium heat until they are golden and crispy on each side.

Yes, you can add other ingredients such as olives, fresh herbs, or vegetables to the filling to vary the flavors.

The bricks can be served hot as an appetizer, as a main course with a salad, or as a snack. Serve them with a sauce or dressing of your choice to accompany them.