This is an American chef's recipe on the Internet, and then adjusted according to the existing ingredients in the home. The original practice was to use cheese, red pepper, broccoli and yellow mustard sauce and balsamic vinegar. Remove the cheese, change the broccoli into a bitter, do not add balsamic vinegar, and use the red and yellow peppers directly in the vinegar. It is also delicious.
Apply a small amount of yellow mustard sauce to the slices of bread.
Put the bitter and red and yellow peppers in turn and finish.
If you are using fresh red pepper, you can fry it in advance or bake it.