Heads Up:Down in the Rio Grande Valley, there's a special treat that's traditionally eaten on Sunday mornings: barbacoa de cabeza. Luckily, in Houston you can enjoy it every day at La Flor Taqueria [4328 Washington Avenue, (713)880-1981], along with a host of other breakfast tacos that will set you back 85 cents to $1 each. Since it has been cooked for hours, the somewhat stringy, well-seasoned beef is fall-off-the-bone tender. Be sure to treat your meat right: Order it with homemade corn tortillas and refried beans, and top it with chopped onions and cilantro, with a salsa on the side that'll make you cry. And for those of you with a shaky grasp of Spanish, the name roughly translates to "barbecued head," as in beef head. Consider yourself warned.