Preheat the oven to 375°F (190°C). Line a large round pizza pan or baking sheet with parchment paper for easy transfer and cleanup.
Open one can of crescent roll dough and gently unroll it on a lightly floured surface or a piece of parchment. Separate it into triangles, pressing any torn seams back together with your fingers.
Using a sharp knife or pizza cutter, slice each crescent dough triangle lengthwise into two thinner triangles so you have smaller pieces to wrap around the cocktail sausages.
Place one cocktail sausage at the wide end of a dough strip and roll it toward the point so a bit of sausage peeks out on each end. Repeat until you have wrapped sausages with the available dough pieces.
On the prepared pan, lightly trace a circle with a bowl or small plate (about 8–9 inches wide) as a guide. Arrange the wrapped sausages around the circle with the pointy ends facing outward and the sausages slightly angled so they touch and form a ring. If needed, start a second ring just inside the first.
Open the second can of crescent roll dough, repeat the cutting and wrapping process, and continue building the wreath until you have a thick, double-layered ring of pigs in a blanket.
In a small bowl, whisk together the beaten egg and water. Gently brush the exposed dough with the egg wash, then sprinkle with sesame seeds or poppy seeds if using.
1 large egg, 1 tablespoon water, 1 tablespoon sesame seeds or poppy seeds
Bake for 18–22 minutes, or until the dough is puffed and deep golden brown and the sausages are hot. Start checking at 16–17 minutes. If the top browns too quickly, loosely tent with foil and continue baking.
If desired, immediately brush the hot wreath lightly with melted butter for extra flavor and shine.
1 tablespoon butter
Let the baked wreath cool on the pan for about 5 minutes, then carefully transfer it to a serving platter. Tuck parsley and rosemary sprigs around the center to resemble a wreath and add cherry tomatoes or sliced mini peppers as decorative "berries."
1/2 cup fresh parsley sprigs, cherry tomatoes or sliced mini bell peppers, fresh rosemary sprigs
In a small bowl, whisk together the Dijon mustard, honey, mayonnaise or Greek yogurt, and a pinch of salt until smooth. Adjust sweetness or tang to taste.
1/4 cup Dijon mustard, 2 tablespoons honey, 1 tablespoon mayonnaise or Greek yogurt, 1 pinch salt
In another small bowl, stir together the ketchup or BBQ sauce, hot sauce or sriracha (to taste), and Worcestershire sauce until combined.
1/4 cup ketchup or BBQ sauce, 1 teaspoon hot sauce or sriracha, 1/2 teaspoon Worcestershire sauce
Pour ranch dressing or warm queso into a small serving bowl, if using, to serve alongside the wreath.
ranch dressing or queso
Place the dipping sauces in the center of the wreath or around the edges. Serve warm. Guests can pull off individual pigs in a blanket by hand.