MEAT AND GREET: Sir Paul McCartney offered a recipe for vegetarian living in London Monday. The former Beatle and his designer daughter Stella hosted a luncheon at a restaurant in St. James’ Park, to support “Meat Free Monday,” their initiative to encourage Brits to down their steak knives in favor of vegetarian options at least one day a week. “America and Australia have also brought to light the damage [the meat industry] is causing to our planet, so even if you take one day a week to be a vegetarian then this will make a dramatic difference,” said the musician. “Our family has been like this for years — vegetarian, that is.” Yoko Ono, Kate Bosworth and Kelly Osbourne attended the green gathering and grazed on Linda McCartney mini sausages, burgers and a range of vibrant seasonal greens.