No heat at all, and the only work is draining things properly.
Dressing first, in the bottom of the bowl. Mustard whisked with the vinegar, then the oil trickled in while stirring. It will thicken as it goes.
- Dressing made.
- Drained potatoes, halved, turned through it while the dressing is undiluted: they take on the most.
- Drained green beans and olives folded in.
- Drained tuna in large flakes and the capers on top, folded twice, no more.
- Plenty of pepper.
Five minutes standing improves it noticeably; the potatoes absorb the dressing and stop it pooling.
Serves 3.