Step by step

Melt a little butter in a saucepan, then add some flour until it is absorbed

Tips
If you want to prepare the recipe for peppers stuffed with vegetables which you grow at home, remember that you plant your peppers in February and March, and pick them between the months of June and September.
Trivia
The pepper has its origins in Latin American and arrived in Europe, along with many other foodstuffs, following the voyage of Christopher Columbus.