There are a lot of steps to make Creubens, but it's worth it!! Ideally, you would make the croissants ahead of time, with a plan to have the corned beef in the crock pot while you work. You can certainly use crescent roll dough from the refrigerator section of your local grocer, or, if you're feeling bold, you could ask your local baker for their croissant scrap. It does exist! Whether the baker will part with it, you won't know until you ask!
If you want to make your own French pastry, I'd recommend a sourdough croissant recipe, like this. Be sure to make an egg wash with one egg and a splash of milk, to ensure that golden glow.
Happy cooking!!What you need:
1.5-2 pounds corned beef brisket with spice packet
2 (12 oz) bottles of beer
2 bay leaves
¼ cup peppercorns
1 bulb garlic cloves, separated and peeled
Thousand island dressing
Croissant or crescent roll dough