I had a great experience with my grandpa when he was still alive. He owned a sweet potato farm, and every time he harvested his potatoes, he would always cook roasted potatoes. At first, I was hesitant to try them, but after taking my first bite, I couldn’t help but say, "This is so delicious!"
You're so lucky that there are vendors selling roasted potatoes in your area. I'm not sure if we have them here. I only know that they sell raw potatoes.