Heat olive oil in skillet over medium heat.
Sauté garlic and onion until soft, about 3 minutes.
Add shredded jackfruit, cook for 5 minutes, stirring occasionally.
Mix soy sauce, rice vinegar, maple syrup, ginger, and sriracha in a bowl.
Pour sauce over jackfruit, stir well, cook 2 more minutes.
Stir in chopped water chestnuts, green onions, and cilantro.
Season with salt and pepper to taste.
Spoon mixture into butter lettuce leaves, fold and serve immediately.