Combine Peanut Butter and Soy Sauce: In a medium bowl, whisk together the natural unsweetened peanut butter and low-sodium soy sauce (or tamari/coconut aminos for a gluten-free option) until smooth and well combined.
Add Rice Vinegar and Brown Sugar: Add the rice vinegar and brown sugar to the peanut butter mixture, stirring until the sugar has dissolved and the ingredients are fully incorporated.
Incorporate Chili Garlic Sauce: Stir in the chili garlic sauce, starting with 2 teaspoons and adjusting to taste depending on your desired level of spiciness. Mix well to evenly distribute the flavors throughout the sauce.
Add Lime Juice, Garlic, and Ginger: Squeeze in the fresh lime juice and add the pressed or grated garlic cloves and grated ginger root to the sauce. Stir to combine, ensuring that the garlic and ginger are evenly distributed.
Adjust Consistency: Depending on your preference, gradually add warm water to the sauce, 1 tablespoon at a time, until you reach your desired consistency. If you prefer a thicker sauce, use less water; for a thinner sauce, use more water.
Taste and Adjust: Once the sauce is well mixed, taste and adjust the seasoning as needed. You can add more soy sauce for saltiness, more brown sugar for sweetness, more chili garlic sauce for spiciness, or more lime juice for acidity.
Serve or Store: Use the Thai peanut sauce immediately as a dip, dressing, or sauce for your favorite dishes. Alternatively, transfer any leftovers to an airtight container and store in the refrigerator for up to one week.