I was so excited about spring garlic at our neighborhood Greenmarket on Friday that I jumped on the 6 train to Union Square on Saturday, after many weeks, only to find the usual March Brownmarket. So I was up for distraction when I passed a woman strutting down Fifth with a stack of Eataly pizzas and headed straight there, and straight in. Where I spotted fresh morels for $75 a pound, easily the most I have ever seen them in 20-plus years of tracking them, and also asparagus that was described as “US” on the chalkboard but tagged with “produce of Mexico” on each bunch. I Tweeted about both, which clearly struck an “emperor’s new food” chord, which made me go back and Tweet that any asparagus this time of year should be labeled NA — not for “not applicable” but for North American. I personally don’t want imported asparagus, but it’s an artificial border in springtime for those with no patience for Jersey green. Still, this validates country-of-origin labeling. I doubt 99 percent of Americans give a flying spear where their food comes from. But what’s the harm in telling them?