Bring the whole cream with milk, sugar and vanilla extract to the boil in a pan. Let it reduce slightly, approx. 5 - 10 minutes. Squeeze out the gelatine well. Add while stirring with a whisk.
Fill into glasses or molds and cover and chill for 4 - 5 hours.
Mango sauce:
Cut the ripe mango into small pieces. Simmer with the mango and lemon juice for a few minutes. Depending on the taste and degree of ripeness of the mango, add a little more sugar. Let cool down.
I usually serve the panna cotta by the glass. Alternative: Dip the mold briefly in warm water. Use a sharp knife to loosen the panna cotta from the edge of the mold and turn it out.
I serve the mango sauce cold or at room temperature, but it can also be reheated before serving.