When we talk about putting together a well-stocked pantry and refrigerator, several items immediately come to mind: boxed pasta, canned coconut milk, dried beans, fresh herbs, nice tinned fish and — of course! Japanese egg salad sandwich I've waxed poetic about the enduring allure of Kewpie on "Saucy," Salon's weekly condiment column. "The acid is a bit higher, it's a …