Grouper Steamed in Banana Leaves

Ingredients

• 1⁄2 cup tamari
• 4 Tbsp. fish sauce
• 2 tsp. lemongrass, finely chopped
• 1 tsp. Sriracha
• 1 Tbsp. sugar
• 4 (6-oz.) grouper filets
• 4 (10-by-12–inch) banana leaf sheets
• 4 (1/2-by-12–inch) thin banana leaf strips
• 1 red bell pepper, julienned
• 1 stick butter, room temperature
• Zest of 1/4 lime
• 1⁄4 tsp. minced lemongrass
• 1⁄2 tsp. minced ginger
• 1 tsp. chopped cilantro