I’m visiting Penghu again right now and I spent one night on Wang’an Island. There I had cuttlefish soup at a “famous” eatery. It was OK but nothing to write home about, just not much of any flavor. So my two nights on Penghu proper I opted for Mexican food over local, and it was really tasty. That probably says more about me than about the food.
I can’t handle the “famous” oyster omelette and ba wan with that pink sauce, nor many of the “gloppy” soups. That said, I’ve eaten some excellent pumpkin and chicken soups, and I really like san bei ji and guabao.
In my experience, home cooked food here generally tastes better than what you get from food stalls and restaurants. Years ago, a student gifted me a bilingual cookbook with many Taiwanese and Chinese dishes. The food I cook myself from these recipes is usually outstanding (not that I’m a good cook; I just follow the recipes).