Jonathan Adams, the talented chef-restaurateur of Pub & Kitchen in Philadelphia and the Diving Horse on the Jersey Shore, opened the Rival Bros Coffee truck about a year ago with his childhood pal, Damien Pileggi. The cafe on wheels exclusively serves brews made from beans that the duo roasts themselves, and the drinks have swagger — the signature is the Derringer, named for the pistol, which combines Revolver espresso with thick steamed milk. Their three basic roasts, primarily Latin-American blends, are exceptionally delicious, each in their own way — the lightest, the Featherweight, is citrusy and bright, while the Revolver medium roast delivers the kind of rich, nutty cup I crave, and the Whistle & Cuss, the most assertive of the three, is intense without overwhelming. Happily, though I don't live in Philadelphia, I can still drink Rival Bros Coffee at home — truck not included.