Sealing quiche crust with egg wash made of egg white vs egg yolk?

The last quiche I made had a very soft, leaky crust. I was told that I could fix this by brushing the base of the crust with an egg wash after I blind bake it (and then just throw it back in the oven for a few minutes). My question is, what is the difference between sealing it with an egg wash made of egg white vs an egg wash made of egg yolk?

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