Set bottom of saucepan in ice water to stop the cooking and firm caramel slightly (if caramel is too thin, it will be runny and drip too much). (bonappetit.com)
Bring to a boil over medium - high heat and cook, stirring and scraping down sides and bottom of saucepan with a heatproof rubber spatula to prevent scorching, until thickened and bubbling rapidly, about 1 minute. (bonappetit.com)
(Scrape bottom of saucepan while you stir to keep eggs from curdling.) (bonappetit.com)