This slow-simmered chicken soup is full of flavor – and delicious herbed matzo balls. If you make it in a pressure cooker, the long simmering time is reduced to just 45 minutes. Posted on April 6, 2020April 6, 2020 by Caitlin Acosta This slow-simmered chicken soup is full of flavor – and delicious herbed matzo balls. If you make it in a pressure cooker, the long simmering time is reduced to just 45 minutes. Advertisement