Here is my recipe, and i must say its rather nice
I just make my regular custard recipe
Capella VC @ 16%
French Vanilla Deluxe 5%
Sweetner 2%
Dulce de leche 2%
let this steep for at least 3 weeks
then i add 7% of cup cake worlds (CCW) Rhubarb, and steep further for 1 more week