Christina C.
Yelp
If you're in SF, you need to check out Flats Burger inside Rocks Den (open Mon-Tues, 5-9 PM). They specialize in Asian fusion smash burgers, and they don't disappoint.
The K-Pop Burger was my favorite--juicy patties with kimchi, creamy kimchi mayo, and kalbi sauce for the perfect smoky, sweet, and spicy combo. The Filipino-Inspired Burger with chicken and beef longganisa patties was packed with rich flavor, and the optional fried egg made it extra indulgent. The Wasa-bush Burger had a great wasabi mayo kick, though I think a pickled cucumber would've balanced it even more.
Their sauces--like K-Pop (kimchi mayo), Wasabish (wasabi mayo), and Sarap Manila (banana ketchup mayo)--are all house-made and amazing. Pair your burger with fries, Cajun fries, or tater tots for a perfect meal.
The staff is super friendly, and you can taste the care they put into everything. Flats Burger is a hidden gem--definitely worth the trip!