With truly serious cases of Sunday sickness, there's absolutely no time for an experimental hangover cure. In these situations, the only acceptable remedy is a proven one: the ever-reliable bloody mary. And Clarke's serves the staple right. Their version includes pulpy tomato juice spiked with vodka and seasoned with celery salt, pepper, and fresh horseradish. It's all poured into a tall water glass over a fistful of ice cubes. There's no unnecessary flair or surprise twists or dreaded factory-made mixes. It has just enough bite to blast the sinuses clear and enough body to settle an uneasy stomach. Like Clarke's itself, the drink is a classic idea refined to the essentials. So order another or two more — it's feasible at five bucks to nibble around the huge pimento olive garnish and prep for an Irish-style midday meal. The bloody mary and brunch — Sundays 11 a.m. to 4 p.m. — are a hug for your ailing gut.