Start by heating your wok or large skillet over medium-high heat until it’s hot and shimmering, giving off a faint haze.
Add vegetable oil to the pan, swirling to coat the surface evenly, and wait until it just starts to shimmer.
Toss in the shrimp and stir constantly, listening for a gentle sizzle. Cook for about 2 minutes until they turn pink, slightly opaque, and feel firm to the touch.
Add the minced garlic and sliced Thai chili to the pan. Stir quickly, and cook for about 30 seconds until fragrant, noticing the garlic turn golden and release a nutty aroma.
Pour in the fish sauce and sprinkle the sugar into the pan, stirring constantly to dissolve the sugar and evenly coat the shrimp and aromatics. You’ll see the sauce become glossy and aromatic.
Squeeze the lime juice over the mixture and give everything a quick stir. The sauce should bubble gently, brightening the flavors and enhancing the aroma.
Turn off the heat and quickly toss in the chopped Thai basil leaves. Stir gently until the basil releases a fragrant aroma and slightly wilt, about 10 seconds.
Transfer the stir-fry to a serving plate immediately to preserve the vibrant aroma and fresh flavors. Serve hot, garnished with extra basil or lime wedges if desired.