If the Leonardo DiCaprio sighting at Moomba didn’t send you reeling, the sugar high from the restaurant’s Cookie Jar surely will. Three warm homemade chocolate-chip cookies are stacked on a plate with two Valrhona fudge brownies tucked between them. The entire mound swims in a pool of crème anglaise with what looks like a chocolate breadstick laid across the top. At the rate Moomba’s socialite clientele is lapping them up, pastry chef Wendy Israel may just render the term social X-ray obsolete.