Heidi Stober (Gretel) and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Heidi Stober (Gretel) and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Robert Brubaker (The Witch), Heidi Stober (Gretel), and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Heidi Stober (Gretel) and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Sasha Cooke (Hansel), Michaela Martens (Gertrude), and Heidi Stober (Gretel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Michaela Martens (Gertrude) and Alfred Walker (Peter) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Heidi Stober (Gretel) and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Heidi Stober (Gretel) and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Heidi Stober (Gretel) and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.

Heidi Stober (Gretel), Robert Brubaker (The Witch), and Sasha Cooke (Hansel) in San Francisco Opera production of Hansel and Gretel. Photo by Cory Weaver.