Steam or boil the chestnuts until cooked.

Finely chop the onion and carrot.

Lightly sauté the chopped onion and carrot in a pan with a little vegetable oil.

Mash the cooked chestnuts while they are still hot.

Mix the mashed chestnuts with the sautéed vegetables.

Add mayonnaise, salt, and pepper to the mixture and adjust seasoning to taste.

Prepare the sausages and optional cheese.

Take a portion of the chestnut mixture and shape it around a sausage or cheese to form a mini hot dog shape.

Repeat the process for all sausages or cheese pieces.

Prepare the coating ingredients: flour, beaten egg, and breadcrumbs.

Coat each mini hot dog in flour, then dip in beaten egg, and finally coat with breadcrumbs.

Heat vegetable oil in a deep pan or pot to the appropriate frying temperature.

Fry the coated mini hot dogs until golden brown and crispy.