Whisk milk, cream, sugar, and zest together. Add the caramelized fennel and simmer on medium low heat. Scald the mixture once and remove from heat. Cover and let it steep for about 3 hours in the refrigerator.
Puree in a blender and then strain through a sieve.
Pour the mixture into the ice cream maker bowl and follow the manufacturer's directions to make ice cream.
Recipe by Eat Thrive Glow at https://www.eatthriveglow.com/fennel-orange-ice-cream/