Put all ingredients in a bowl and knead by hand until everything is combined. Refrigerate for at least 30 minutes.
Roll out dough in a circle shape.
Cut off the green part of the strawberries and cut them into halves. Mix with lemon slices, sugar, salt and starch.
Spread ground almonds in the middle of the dough. Make sure it stays a three fingers wide margin. Place the strawberries on the almond flour and fold the dough over it. Put for 30 minutes in the freezer.
Meanwhile, preheat oven to 180 ° C.
Before baking, mix egg yolk and milk and brush the edge of the Galette . Sprinkle with brown sugar and bake for about 20 - 25 minutes.