01
Shrimp
5.0best for quiche1 cup : 1 cup
Mild sweet shellfish; different texture entirely, use in stir-fries where seitan would go, not vegan
5.0
seitan substitute
in quiche.
Seitan in Quiche add protein and substance to the custard filling. The replacement should pre-cook cleanly and not water out the egg mixture.
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adjustment for this dish
Shrimp releases 20% of its weight as brine inside a custard bake, unlike seitan which weeps plain water; salt 1 cup raw peeled shrimp for 10 minutes then rinse and pat fully dry before it enters the blind-baked shell. Tuck shrimp tail-up into the custard so they poach evenly; skip pre-cooking because 42 minutes at 350F brings them to a tender 145F without rubberizing.
02
Tofu
5.01 cup : 3/4 cup
Chewy wheat gluten; higher protein density
5.0
adjustment for this dish
Tofu delivers 85% water against seitan's 55%, so press 0.75 cup firm tofu for 40 minutes under 3 lbs then crumble and dry-saute for 5 minutes before the shell. The custard cream ratio stays at 4 eggs to 1.5 cups, but add 1 tsp cornstarch to the whisk because tofu still gives up some water during the 42 minute bake and the starch catches it.
03
Bacon
5.01 slice : 1 slice
Smoky salty meat; crumble bacon into dishes where seitan adds protein, not vegan
5.0
adjustment for this dish
Bacon renders fat directly into the custard, a behavior seitan can't mimic, so cook 4 slices in the oven at 400F on a rack until crisp (12 minutes), drain, and crumble into the blind-baked shell. Reduce the cream in the custard from 1.5 cups to 1.25 cups because bacon fat contributes another 2 tbsp of rich liquid that would otherwise break the set.
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04
Ground Turkey
5.01 lb : 1 lb
Lean ground poultry; browns and crumbles like seitan, adds mild savory flavor, not vegan
5.0
adjustment for this dish
Ground turkey must reach 165F and will sit in the custard for 42 minutes, so only brown 1 lb turkey to a pale 140F in the pan (about 5 minutes) and let the quiche bake finish it. Drain all pan liquid since turkey is 75% water; undrained, the egg-cream won't jiggle at 45 minutes and the crust waters out at the base of each slice.
05
Pork
3.31 lb : 1 lb
Chewy meat-like texture, absorbs marinade well
3.3
adjustment for this dish
Pork renders both fat and water as the custard sets around it, unlike seitan which renders only water; brown 1 lb ground pork in a cold pan for 9 minutes and drain the pour-off completely before it hits the shell. Pork fat at 20% already enriches the filling, so drop the cream from 1.5 cups to 1 cup and bump eggs from 4 to 5 to keep the same set strength at 350F.
technique for quiche
technique
Seitan in quiche dumps moisture into the custard during the 40 minute bake, which prevents the egg-cream mixture from setting to a clean wedge and leaves a soggy crust. Dice to 1/3 inch, dry-saute in a hot skillet for 4 minutes until the surface tightens and pores close, then spread on paper towels for 5 minutes before it hits the blind-baked shell.
Blind bake the crust at 400F for 15 minutes with pie weights so the bottom is golden and sealed, then lower to 350F for the filling bake. 5 cups cream (not half-and-half, which weeps) and scatter 1 cup pre-dried seitan plus 1/2 cup gruyere across the base before you pour.
Pull when the center jiggles like loose jelly at 42-48 minutes; carryover heat finishes the set. Unlike an omelet, where seitan only rides with the curds for 90 seconds and can be lightly seared, quiche seitan sits in the custard for 45 minutes and MUST be dried first or the filling waters out under its own slice weight.
pitfalls to avoid
watch out
Don't pour custard over undried seitan; the 40 minute bake can't evaporate the water it releases and the filling settles into a wet layer above a soggy crust.
watch out
Avoid skipping the blind bake because a raw shell under a wet seitan filling turns gummy and tears when you try to cut a clean wedge from the dish.
watch out
Skip half-and-half in favor of heavy cream at 1.5 cups per 4 eggs; lower fat dairy weeps during the set and the custard cracks across the top as it cools.
watch out
Don't bake past a 48 minute mark waiting for a firm center; a jiggle in the middle is correct at 350F, and an over-set quiche turns rubbery and grey around the seitan.
watch out
Avoid packing more than 1 cup of seitan into a 9 inch shell because extra protein crowds the custard to a thin layer and the slice won't hold its shape at the point of the wedge.