For the gelato
Melt the butter in a non-stick pan until it browns. Mix the plain base with Nonna Rachele paste, the browned butter and salt, then churn the mixture.
For the garnish
Using a planetary mixer, mix the invert sugar with 500 ml of milk and the cold Custard Mix. Pour into a piping bag and place in the fridge.
Decorate with Marbling Amarena Fabbri and the previously prepared custard, using a ribbed piping bag nozzle. Lastly, embellish as desired with Amarena Fabbri.