Beer Brats in Blankets and Smoked Gouda Fondue

Name: Beer Brats in Blankets and Smoked Gouda Fondue
Prep time: 20 min
Cook time: 55 min
Total time: 1 h 15 min
Cuisine: European, German
Ingredients: 1 (19 oz) pkg uncooked bratwurst sausages (5 brats); 2 (12 oz) bottles plus 8 oz (1 cup) Warsteiner Dunkel beer, divided; 1 (17.3 oz) pkg puff pastry dough, thawed; 1 Tbsp plus 2 tsp Dijon mustard (divided); 1 large egg (plus 1 Tbs water to make an egg wash); 1 Tbsp sesame seeds; 8 oz smoked Gouda cheese (shredded); 4 oz Vermont white sharp cheddar cheese (shredded); 8 oz cream cheese