Normally, you’d need a passport and a translator to sample offerings as exotic as those found at this budget-friendly storefront. You can order tom kha and pad thai at dozens of storefronts. Here, veer toward the less common: curry-flavored sai oua sausage, banana blossom salad dressed with a sweet-spicy lime broth, and garlicky barbecue pork set over steamed egg noodles. Generous portions of rich fare at takeout prices turn most first-timers into devoted regulars.