In the heart of downtown Los Angeles, you’ll find a private cannabis chef cooking weed-infused pizza à la Naples, Italy, in a wood fire oven. The exclusive Stoney Slice exists in the liminal private-bordering-illicit cannabis chef world, where it’s not quite accessible to have a storefront, and it’s not possible to serve pizzas in dispensaries due to single-serving regulations. “For pizza, the category doesn’t exist yet,” says founder and head chef of Stoney Slice, Kashka…