Prep all fresh ingredients as listed above (mincing, chopping, slicing, etc.).
Make the Iced Rooibos Tea: Bring the water to a boil, then remove from heat. Add rooibos tea bags (or loose tea in an infuser) and steep for 10 minutes. Remove the tea bags or strain the tea, then stir in honey or sugar to taste. Chill in the refrigerator until ready to serve.
Prepare the Cucumber Salad: combine all the ingredients in a bowl. Set aside to marinate.
Prepare the Cowboy Butter: In a bowl, mix together all the ingredients. Set half aside for later use.
Marinate the Chicken: Season the chicken with salt and pepper. Coat the chicken thighs with half of the cowboy butter.
Cook the Chicken: Preheat the air fryer to 400°F (204°C) or the oven to 400°F (204°C). Place the marinated chicken thighs in the air fryer basket or on a baking sheet. Cook for about 15 minutes, or until the internal temperature reaches 165°F (74°C).
Assemble the Sandwich: Toast the sub rolls until golden brown. Spread the reserved cowboy butter on the inside of each roll. Slice the cooked chicken thighs into strips and place inside the rolls. Top with a generous spoonful of cucumber salad. Close the sandwiches and cut them in half.
Serve with carrot sticks and hummus, and iced rooibos tea.