We're connoisseurs of peanut sauce, and lately our obsession has taken us many times to Tempe, where the friendly staff at Lemon Grass Thai have perfected the most heavenly version yet. We're keen on the sizzling beef, a house specialty that sounds quite simple (tender slices of beef, served up on a searing-hot platter, with spinach, cucumbers, and slivered almonds) but that is truly beguiling. Slathered in luscious peanut sauce that's creamy and complex — definitely more than just thinned-out peanut butter — the beef tastes out of this world. Satay chicken comes with the same standout peanut concoction, and you can get a side order of the sauce as well. Seriously, we could dunk everything in that and call it a good meal.