Don’t freak out if you see foam or espuma in a recipe. If you don’t feel like making it, just dice or slice some fresh ripe guava instead. Essentially the same…
Spray a 16 × 20cm kidney tray with nonstick cooking spray. Heat the sugar, butter, milk and salt, and stir over low heat until the sugar is dissolved. When the sugar is dissolved, add the condensed milk and vanilla essence. Using a sugar thermometer, cook to 115°C. Transfer the mixture to the bowl