Cipolline in Agrodolce

Procedure

1. Blanch the onions 1 minute. Drain and peel.
2. Put the onions in a sauté pan in a single layer. Add the water and butter and cook slowly, uncovered, about 20 minutes, or until fairly tender. Add a little water if necessary during cooking so that the pan does not become dry. Stir gently from time to time.
3. Add the vinegar, sugar, and sa