Preheat the oven to 180°C.
Spray a small pan with butter and sprinkle with flour.
Into a bowl add the flour, salt, baking powder, and mix them.
In another bowl put the eggs, sugar, and butter and mix them with a hand mixer for 3 - 4 minutes until they become soft and fluffy.
Slowly add into your fluffy mixture the ingredients of the first bowl.
Last, add the milk, lemon zest, lemon juice, and the seeds and mix them for 3 more minutes until they become one soft mixture.
Put it into your pan.
Bake for 50 - 60 minutes.