Roughly chop the almonds. Melt the butter. Mix 100 g sugar, salt, lemon peel, vanillin sugar, flour and almonds. Add butter and crumble. Cover and chill.
Wash, clean and cut the rhubarb into pieces. Mix 100 g sugar and starch and mix with rhubarb. Grease the portioned pit cups (15 cm Ø) and add the rhubarb. Spread the crumbled dough over the rhubarb.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven 150 °C/ gas: level 2) for 20-25 minutes. Remove the rhubarb crumble, let it cool down a little and serve lukewarm with vanilla ice cream. Dust with icing sugar and decorate with mint.