Combine the heavy cream, vanilla pods and seeds, and the sugar in a 1.92-L/2-qt sauce pot. Bring to a boil and then strain through a fine-mesh sieve.
Stir in the bloomed gelatin with a whisk until it dissolves.
Using a funnel gun, portion the panna cotta into 30-g/1-oz tins, filling them halfway. There will be panna cotta left over, which you can hold in the refrigerator for up to 5 days.
Let the panna cotta set in the refrigerator. Reserve refrigerated. Discard after 2 days. Once it is portioned into the tins, it will develop a skin on the surface over time, even when wrapped, since the wrap will not be directly on the surface of the panna cotta.