Thomas mentions again and again the effects of the egg white on his brain and body, but egg whites aren't part of the ingredients in a standard gin fizz. It couldn't be the Ramos gin fizz, that floral and sticky sweet staple of the New Orleans brunch that's perhaps the most famous egg-white cocktail; it's just not something you can drink day in and day out. I asked SAVEUR contributing editor David Wondrich, a cocktail expert, to help me out. A gin fizz, he explained, is a mix of gin, sugar, and lemon juice; what Thomas was describing had to be a silver fizz, which adds an egg white into the mix, creating its distinctive creamy body and heady froth. I made it the night I got my answer: tiny bubbles clinging to the rim of the glass, a thick layer of white foam bubbling on top. Taking a sip, I closed my eyes and let it frost my lips; just like Walker Percy described, I was drinking a silver fizz. Tonight it's your turn.