Mix flour, baking powder and salt.
Beat softened butter with sugar. Then add the egg, vanilla and lemon juice and beat for 20-30 seconds. mixer.
At low speed of the mixer, add flour in small portions.
With a spatula, mix in all the sesame seeds (it can be fried in advance).
Heat the oven to 180 degrees. On sheets of baking paper (required!) Spread cakes with a teaspoon at a distance of 3-4 cm from each other, since cookies can spread.
Bake 8-15 minutes, depending on size. You need to make sure that they do not burn (you can turn over to the other side after 6 minutes). They are soft and sticky while hot, but then when they cool down they become crispy and unrealistically tasty.