Preferably overnight~ soak the fruits with the rum or apple juice
Combine the aquafaba, cornstarch & oil together in a small bowl & set aside
Whisk the yeast into the warm plant milk & give it a pinch of sugar, let stand 5-10 minutes to frothy~ this "proves" that your yeast is alive & you can use it
In a large mixing bowl (or in your electric mixer with the dough hook attachment) combine the flour, spices, zests, sugar, salt, softened vegan butter & the aquafaba mixture & mix by hand or on low speed of your electric mixer to combine evenly
Continue mixing to develop the dough about 5 minutes on medium speed with your mixer or 10 minutes by hand.
If the dough is still too soft & will not come together to a pliable soft elastic dough, add more flour one tablespoon at a time.
Transfer the dough to a lightly oiled bowl & cover in a warm spot for about an hour or until almost doubled in size.
Drain the fruits & discard the liquid, add this to the dough along with the sliced almonds & knead by hand on a lightly floured surface until all the fruits & nuts are incorporated
Roll the dough on a lightly floured surface to less than ¼" thick, this will be about 12" x 18" (the size of a half sheet pan)
With pastry cutter, cut strips about ½" thick then wrap each strip around a lightly sprayed metal baking horn *see video tutorial
Lay each horn on a parchment lined sheet pan spaced 1" apart then set them aside in a warm humid spot to rise again to fluffy~ about 1 hour
Preheat the oven to 350°F once the dough has risen, brush them with aquafaba, then sprinkle with granulated sugar & bake for approximately 25-30 minutes
Meanwhile prepare the buttercream recipe as per the instructions on that recipe post & mix it with the softened almond paste for a creamy almond cream filling
Once the stollen horns are completely cooled, remove the metal baking horns & fill each one with the almond cream
Dip the ends in sliced toasted almonds & drizzle with chocolate *optional