One 14-pound 50-day dry-aged prime rib roast, rib bones frenched (see Note)
Kosher salt
Pepper
2 bunches of long rosemary sprigs
1 pound sour cherries, pitted
1/2 cup sugar
Softened beurre de baratte or other European-style butter, finely grated bitter chocolate (80%) and shaved summer truffle, such as Périgord, for serving
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