Beef Bossam and Leftover Banh Mi Sandwiches

Ingredients

• 1 cup hoisin sauce
• ½ cup Sriracha
• ¼ cup soy sauce
• 2 cups beef stock
• 8 cloves garlic, chopped
• 3½ pounds beef chuck
• 1 teaspoon salt
• 1 tablespoon sugar
• 1 tablespoon sesame seeds
• 1 cup rice vinegar
• 1 English cucumber, sliced ½-inch thick
• ½ sweet onion, sliced very thinly
• 1 cup shredded carrot
• 1 jalapeño, thinly sliced (optional)
• 1 cup mayonnaise
• 2 heads Bibb lettuce
• Rice, cooked as desired to include in wraps
• 1 bunch cilantro
• 1 bunch mint
• French bread, as needed for picnic leftovers