The original post at NAMI-NAMI calls these an Estonian crumb cake, but in my mind it's not a cake. This is a buttery crumb bar with strawberry (or other if you choose) jam sandwiched between the piles of crumbs. Tasty, but not my treat of choice since there is no chocolate involved.
Strawberry Jam Crumb Bars
3 1/3 cups flour
3 oz. sugar
Pinch of salt
14 Tbsp. cold butter, cubed
1 pint strawberry jam
Preheat the oven to 400ºF. Grease a 9 x 13 pan, and set aside.
Combine the flour, sugar, salt and butter in a food processor until the mixture resembles wet sand. Transfer 1/3 of the mixture to a small bowl, and set aside as the crumb topping. Add the egg to the food processor, and process until well mixed.
Pour into the prepared pan, spread evenly and press down with the palm of your hand. Spread the filling evenly over the crumb base, leaving a bit of room between the jam and the edges of the pan if you desire an easier pan to clean. Sprinkle with the remaining crumb mixture.
Bake 30 minutes or until crumb topping is lightly golden. Cool completely before cutting into bars.