Sea Bladder

First, a carpet of narrow, grey leaves emerges, which are especially delicious when harvested young. Sweet at the top and slightly bitter otherwise... Don't eat them in excess, as, like beans, the leaves contain saponins. Briefly boiling or stir-frying removes the (likely harmless) saponins.
The beautiful flowers (pink, veined, bladder-shaped receptacle – typical for silene – and bright white petals) can be eaten in abundance: sweetish, fresh, and slightly resembling purslane.
The plant grows wild along the coast and can therefore tolerate salty air and salt water.

Names:
Latin: Silene uniflora, or also Silene maritima
Dutch: Zeeblaasjes
Also: Zeelijmkruid
English: Sea Campion