Sal’s Place, a Scrappy Pop-Up Restaurant, Shuttles Between L.A. and the East Coast

Sal’s Place is easy to miss. Almost obscured by bougainvillea. it sits on a corner of North Robertson Boulevard in West Hollywood, Calif., a jumble of a building anchored by a tent draped over a frame of wood and windows. There is no valet parking — even here in Los Angeles — and no sign. To get to a bathroom, diners walk out the front door and turn left on the sidewalk.And it’s open only about six months a…