In a measuring cup, whisk together the maple syrup, coconut aminos, rice vinegar, toasted sesame oil, and red pepper flakes until well combined. Gradually mix in the arrowroot powder until the sauce is smooth and free of lumps. Set the sauce aside.

Heat a tablespoon of olive oil in a large skillet over medium-high heat. Add the ground beef, breaking it apart with a spatula, and cook for about 5 minutes until browned.

Stir in the minced garlic and grated ginger into the skillet with the ground beef. Sauté for 1-2 minutes until fragrant.

Add the finely diced red bell pepper and shredded carrots to the skillet. Sauté for about 3-4 minutes until the vegetables soften slightly.

Pour the prepared sauce mixture over the beef and vegetable filling in the skillet. Stir and simmer for 2-3 minutes until thickened.

Spoon the savory beef and vegetable filling into the crisp Boston Bibb lettuce leaves and sprinkle sesame seeds on top.