Scrape the bottom of the pan often with your spatula, and decrease the heat gradually as more and more moisture cooks out of the jam.

WSJ: Gourmet Spreads

Generously cover the bottom of a large frying pan with olive oil and place over a high heat.

CNN: Frankie's parmigiana

Return pan to low heat and cook until vegetables are soft, about 5 minutes, stirring constantly and scraping the pan bottom well.

NPR: The Comforts of Food