Cheflebrity Spike Mendelsohn is branching out once more, prepping a steak frites concept — tentatively tagged “Béarnaise” — projected to open this fall on Capitol Hill.

According to the Washington Business Journal, Mendelsohn has locked down plans to take over the Thai Roma spot (313 Pennsylvania Ave. SE), conveniently located just a few doors down from his pre-existing properties, We, The Pizza (305 Pennsylvania Ave. SE) and Good Stuff Eatery (303 Pennsylvania Ave. SE).

A Mendelsohn aide declined to offer any specifics about the potential fine-dining venture, stressing that construction plans are not yet finalized. “But we are thrilled to open up another restaurant in such a supportive neighborhood,” the aide tells HOH.

Steak frites are classic French bistro fare and would play into Mendelsohn’s formal training. Long before reality TV came a-callin’, Mendelsohn honed his craft at award-winning Gallic standard-bearers Les Crayeres (Reims, France), Bouchon (Yountville, Calif.) and Le Cirque (NYC).