I guess its moment has been going on for a while (https://www.newyorker.com/culture/kitchen-notes/tomato-tonnato-is-the-sauce-of-the-summer), since this piece is from 2022.
But I know I saw it at least once in Montreal recently, and on the return trip it was ordered at Twelve, in Portland.
With the asparagus.
Did a simple asparagus vinaigrette last night:
Served alongside:
Roasted chicken thighs. Potato salad. Corn.