To make the pastry crust, a mixture of flour, salt, butter, and cold water is blended together and rolled out to line a pie dish. The filling is made by mixing together canned tuna, shredded cheese, eggs, milk, mayonnaise, mustard, and a variety of spices and herbs, such as garlic powder, dried thyme, and black pepper.
The filling is poured into the prepared crust and baked in the oven until the filling is set and the crust is golden brown. The resulting quiche is a hearty and flavorful dish that can be served for breakfast, lunch, or dinner. It can be enjoyed hot or cold, and can be served with a side salad or some fresh fruit.