Long beans fermented in salted water with chili and Sichuan pepper until sour, crisp and golden, popular across southern China. They are eaten as a pickle, stir-fried with minced meat or used in fried rice.
When I have luosifen, I always ask the owner to add extra pickled long beans.
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豆角 here is the yard-long bean, 豇豆. Soaked in salted water with spices until sour, it is chopped and stir-fried with 肉末 (minced pork) and served on 桂林米粉 and 螺蛳粉.