Sauteed Chicken a La Portugaise

THE CLASSIC RECIPE for poulet sauté à la portugaise presents the chicken in a sauce with tomatoes and sliced mushrooms. The rendition that I have taught for many years adds both black and green olives. Also, the mushrooms are quartered (or left whole if small) so they are about the same size as the olives. Although I usually serve this colorful dish during the summer when tomatoes are best, I also prepare it in the winter using good-quality canned tomatoes.

To make things eas