In a medium bowl, add the Sriracha, apricot jam, vinegar, water, and soy sauce together. Whisk until well combined. Add cornstarch and mix until the corn starch has dissolved.
Bring a large pan or skillet to a medium-high heat, add 2 tsp oil and chicken, sauté until browned, about 5 minutes. Note: if you want a crispier result, feel free to deep fry the chicken until crispy and golden.
Remove the chicken and set aside. Add the sauce to the large pan or skillet and bring to a simmer. Cook until thickened and drop in the chicken. Mix to ensure the sauce coats all the chicken pieces. Serve as is or garnish with toasted sesame seeds or chopped spring onion.