Doctors agree that breakfast is the most important meal of the day, due largely to its role in kick-starting the metabolism and its insistence on being first in line. Pad stomachs for the day's activities with today's Groupon: for $5, you get $10 worth of casual American fare for breakfast or lunch at Orangeside Luncheonette in New Haven.

Orangeside Luncheonette's owner, Tony Poleshek Jr., crafts an extensive menu of midday fare fresh daily. Diners can customize three-egg omelets (starting at $4) with a variety of cheeses, vegetables, and meats such as sausage, pastrami, gyro, and hamburger. Fit teeth around a rotating roster of signature square donuts, geometrically designed to hold up layers of frosting and contain exact portions of jelly calculated with an abacus. The chicken-souvlaki sandwich surrounds seasoned chicken, onion, and tzatziki sauce with a pita ($6), and the grilled-chicken sandwich swishes a cape of honey mustard and melted cheese ($7.25). Diners may also search for horoscopes spelled out in the breaded crumbs of clam strips with fries and coleslaw ($6.50). Orangeside Luncheonette's staff crafts each meal quickly, for in-shop eating or on-the-go morsels.