Thai Peanut Chicken Wings

Name: Thai Peanut Chicken Wings
Ingredients: 1 cup creamy peanut butter, preferably Skippy; 1/4 cup plus 2 tablespoons brown sugar, sifted to remove any lumps, plus extra to taste; 2 tablespoons canola oil, more as needed to thin the sauce; 2 tablespoons toasted sesame oil, more to taste; 1 tablespoon Key lime juice, more to taste; 1/4 teaspoon salt, more to taste; 1/4 teaspoon chipotle powder, more to taste; Marinated wings; Vegetable oil for frying; 1 to 2 teaspoons black sesame seeds; Chopped green onions, for garnish; Zest of 3 Key limes; 1/2 cup Key lime juice; 1/4 cup water; 1 small onion, chopped; 2 cloves garlic; 1 teaspoon vanilla extract; 1 teaspoon grated ginger; 2 teaspoons chipotle powder; 1 tablespoon plus 1/2 teaspoon soy sauce; 1 to 4 Thai or serrano chiles, or to taste; 2 pounds trimmed chicken wings, cut at the joint and wing tips removed (20 to 24 pieces)