Sous Vide Chicken in Lettuce Cups

Ingredients

• 2 boneless, skinless chicken thighs
• 2 tablespoons vegetable oil
• 1 1/2 scallions, minced 2 tablespoons vegetable oil
• 1 teaspoon grated fresh ginger
• 1 tablespoon hoisin sauce, plus extra for serving
• 2 teaspoons light soy sauce
• 1/2 teaspoon sesame oil
• 4 ounces (115 g) water chestnuts, minced
• 1 tablespoon minced fresh cilantro
• 1/2 teaspoon freshly squeezed lime juice
• 6 iceberg lettuce leaves
• 1/2 teaspoon sesame seeds
• 1 Thai chile, chopped (optional)