How long can you keep panna cotta?
Consequently, how long can panna cotta sit out?
Serve immediately, or refrigerate, lightly covered, for up to 5 days. The gelatin gets stronger as it sits, so this will be a bit rubbery by days 4 or 5, but you can mitigate this by letting the panna cotta sit at room temperature for about half an hour before serving.
In respect to this, can you put panna cotta in the freezer to set?
Place the glasses in the freezer to set the panna cotta, but do not let it freeze solid. This will take about 30 minutes. Refrigerate the glasses until the panna cotta layers are set, about 30 minutes, or overnight.
One of the tricks to the dish is achieving the right balance of gelatin in your mixture, and sometimes you just need to try again. Heat the mixture over low heat. Separate out a small cupful and add extra (bloomed) gelatin to it; slowly pour it into the heated mixture, stirring constantly, and allow it to set -- again.