In Austria, nobody calls them green beans. They're Fisolen. And if you grew up in an Austrian kitchen, you know the word the way you know salt and bread. Gretel always said that Fisolen were the workhorse of Austrian vegetable cooking, showing up alongside everything from roast pork to Tafelspitz, changing character with the season and the cook's mood.

Speckfisolen is the version that sticks with you. You render good Speck until it goes glassy and crisp, cook onions in that fat until they turn golden and sweet, then toss the whole thing through tender green beans with a splash of vinegar that pulls everything into focus. The vinegar is what makes it Austrian. Without that sharpness cutting through the smoke and fat, you just have beans with bacon. With it, you have a Beilage that can hold its own next to any roast on the table.

I make this at the restaurant in Salzburg nearly every week during bean season. It takes about twenty minutes. The technique is nothing complicated, but the balance matters: enough Speck that you taste smoke in every bite, enough onion for sweetness, enough vinegar to keep it bright. Gretel would taste and adjust, taste and adjust. She never measured the vinegar. She'd add a splash, try a bean, and decide. That's the kind of cooking this is. You learn the ratio with your tongue, not a measuring spoon.