Final answer:
The dish served atop brown butter mashed potatoes varies by restaurant and chef, with sirloin beer tips and gravy being a common pairing. Options could include various types of meat but cannot be determined without specific context.
Step-by-step explanation:
The question pertains to a dish that is served atop brown butter mashed potatoes. The options presented seem to be different types of meat dishes that could potentially be served with mashed potatoes as a side. However, without a specific menu or context, it is impossible to determine a single correct answer to what is served atop brown butter mashed potatoes as it varies by restaurant, chef, or personal preference. However, generally sirloin tips and gravy are a common topping for mashed potatoes in many traditional American eateries. This type of dish would typically consist of pieces of sirloin beef cooked, often with a beer-based sauce, and served with gravy, which complements the buttery flavor of the potatoes.