Preheat the oven to 180°C. Prepare the pie tin by greasing the sides and the bottom, and sprinkling some flour over it.
Mix the egg, egg white, and sugars till creamy. You can use an egg whisker for this.
Into the same bowl add oil, milk, yogurt, lemon peel, lemon juice, and vanilla extract. Mix well with an egg whisker.
Now add flour, baking powder, chopped almonds, and a pinch of salt. Stir the bowl until the flour is well combined. Do not overmix the batter!
Pour the batter into the pie tin. In another bowl mix raspberries, cubes of rhubarb, and icing sugar. Just enough so the icing sugar disappears. Add these mixed ingredients on top - be careful, do not fill to the top of the pie tin, and leave some space for the pie to rise and crumble.
Now mix the flour, oil, and sugar until they are crumbly. If the mixture is too wet and doesn't crumble - add more flour. Now add ½ of the crumble on top of the pie.
Bake for 15-20 minutes. Let the pie cool completely. Add the rest of the crumble on top of the pie.
If you want, you can heat some extra raspberries and pour some on top of the slice of the pie.