For the short pastry 150 g flour, 50 g almonds, butter in pieces, approx. 1 teaspoon salt and 1 egg first with the dough hooks of the hand mixer, then quickly knead it smooth with your hands. Wrap the dough in foil and chill for about 40 minutes.
Meanwhile peel and finely dice the onions and garlic. Heat the oil in a pot and sauté the onions and garlic. Add frozen spinach and 100 ml water, bring to the boil, cover and defrost over medium heat for 14-16 minutes.
Then continue to cook open, stirring for about 5 minutes, until all the liquid has evaporated. Season to taste with salt and pepper.
Rinse fish, dab dry and cut into cubes. Mix with some salt and pepper. Mix sour cream, 3 eggs and frozen herbs. Season with salt and pepper.
Grease a quiche or tart mould (26 cm Ø; alternatively a springform pan). Roll out the dough on a little flour and make it round (30-32 cm Ø), place it in the form, press the rim (at the edge of the springform pan approx. 2 cm high).
Prick the bottom several times with a fork.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3). Sprinkle the base with 2-3 tablespoons of almonds. Spread spinach first, then salmon on top, pour over the top and pour over the sand. Sprinkle with pine nuts.
Bake in a hot oven on the lowest shelf for 50-60 minutes. If necessary, cover with aluminium foil after 30 minutes. Garnish quiche with marjoram.