Try Tibetan. It’s a kind of spicy I’ve never experienced before or since. I’m not a huge spiciness fan, but it’s totally different from the spiciness of Indian or Thai food, the spiciness of Mexican food or even the spiciness of horseradish. I do know that I took a Mexican friend to a Tibetan restaurant and he bravely ordered the hottest level of spiciness and said he totally regretted it.