Whisk the butter with an electric mixer until creamy; Add the garlic and parsley. Replace with foil and cool until firm.
In a large bowl, love meat with salt, pepper and mustard; divide the mass into 4 round lots, cover them and set aside.
Cut the two peppers in half; remove the membrane and seeds. Place them on a tray with the outside up and oil them together. Roast them on the grill of the preheated oven until the skin turns black. Remove and cover with a damp cloth while cooling. Peel them and cut them into strips of 2 cm.
Heat a skillet or oil-smeared griddle. Fry portions on both sides some 3 minutes or until golden and well-made. Roast the inside of the buns and spread the bases between them 4 dishes covering them with slices of cucumber, pepper strips and, At last, the burger. Cut slices of butter and add 1 or 2 to the burger. Cover it all with the bun and decorate it with sprigs of fresh parsley or other herbs.
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