Place bananas into the Thermomix bowl and chop; 10 sec/speed 7.
Add the pistachio praline paste and combine; 30 sec/speed 8.
Add pistachios and blend, 20 sec/speed 8.
Serve immediately with the Florentines or freeze until use. If frozen, it may need to be softened in the fridge for up to 15 minutes before serving.