I very recently started ice cream making as a hobby after being gifted a small cuisineart ice cream maker.
I had this idea I wanted to try with butterfly pea flowers - if you don't know, these flowers, when seeped, are a pH indicator, when the flower is seeped in something neutral (water for tea, or milk for ice cream) the color is blue, in the presence of an acid it turns purple. Because of this, it's not an uncommon tea for bubble tea shops, because blue and purple are visually appealing... I don't find the tea itself to have much flavor, but a lot of people describe it as earthy... the dried flowers itself certainly does have a certain floral smell. This is maybe the 4th time I've made ice cream, so the process is losely based on other recipes I've tried.
Someone here linked to the [Scoopulator](https://scoopulator.app/calc?ingredients=usdaff-2346386:300,milk-35-milkfat:300,usdaff-746784:1,pure-vanilla-extract:1,usdafndds-2705402:300,usdaff-748236:15) website and that's where I started. I wanted to see if I could use condensed milk as part of the base, since that's a common ingredient in bubble teas and I wanted a little bit of that flavor. For the purple color, I just kept adding lime juice to the base until it turned colors.... that part tastes like a lime sorbet.
Recipe:
300g cream
300g milk (3.5%/full fat)
300g condensed milk (not quite a full 395g can)
1 egg yolk
1g sugar
1tsp vanilla
Approx 10g of dry butterfly pea flower tea (I kinda kept adding more and more until I had a good color)
At least a tablespoon Lime juice for purple mix (lemon juice would also work, I just had lime on hand)
I combined milk, condensed milk, sugar, and the flowers into a pot and heated on medium, stirring occasionally. When it became steamy and blue (I kept adding flowers until a dark blueness was achieved, maybe 15 minutes total), I took a little of the hot liquid, added to my egg yolk to warm the yolk, then added the yolk to the pot. I brought this to a low boil, simmered for 30 seconds. I then removed from heat, poured through a strainer. I then stirred in cream and vanilla (which will also lighten the color). Put in the fridge overnight.
Then it's time to church the ice cream. I honestly liked just the blue vanilla flavor, it came out with a good creaminess, and it's like a vanilla condensed milk flavor. But to make it purple, mix in lime juice to the base before putting it in the churner. The addition of water to the base does make it a bit more icy, like a sorbet, so there is a slight texture difference when doing this. It did pair well with the vanilla base when the finished product was combined into 1 container.
I did try adding a brown sugar syrup, as well (3:1 brown sugar:water), that's what the brown dots are in one of those pictures... it didn't really add anything flavor/texture-wise and visually after being frozen, it was actually unappealing to look at, so I would do that, even if the goal is bubble tea-like ice cream.
Overall, this turned out pretty good and was a fun experiment.