ordered an open-faced roast beef sandwich with brown gravy served over a mound of mashed potatoes,
Unclear: is this a mound of mashed potatoes, with the open-faced sandwich and gravy stacked on, or it is mashed potatoes and gravy with the sandwich on the side? Either way, the bread sounds redundant and weird. Never understood an open-faced meat sandwich. Egg salad, yeah, but even then, it's easier to negotiate fillings between two slices of bread.
