In a medium bowl, whisk together peanut butter, soy sauce, sesame oil, lime juice, and honey until smooth and fully combined.
Add minced garlic, grated ginger, and sriracha if using. Whisk until fully incorporated.
Add warm water one tablespoon at a time, whisking after each addition, until sauce reaches desired consistency.
Toss with hot noodles in a wok over high heat for 30–45 seconds, or toss with cold noodles and serve immediately at room temperature.
Notes
Always use natural peanut butter — stir thoroughly before measuring. Add warm water gradually — the sauce loosens quickly. Store refrigerated up to 5 days. Whisk with warm water before reusing.