I haven't tried a pork rind crust per se, but if you add crushed pork rinds to a basic quiche recipe, it becomes sort of muffin-like. You have to allow the crushed pork rinds to sit in the egg mixture to thicken. Then fold in the other ingredients (meat, veggies, cheese) and decrease the amount of added salt.
I used to do that occasionally in order to make the quiches more sturdy and portable.
Pork rind crusts work well for a savory dish. The trick to using low carb flour substitutes is to combine them; use more than one. I'd suggest pork rinds and Ketatoes for a quiche.
Actually a quiche works best without any crust in my opinion, but that's just me.
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