This homemade sweet and sour sauce is the perfect balance of tangy and sweet with a glossy finish that rivals any takeout restaurant. Ready in just 13 minutes with simple pantry ingredients, it's ideal for dipping, glazing, or tossing with your favorite stir-fries.
In a small bowl, whisk together the cornstarch and cold water until completely smooth with no lumps. Set aside.
In a small saucepan over medium-high heat, combine the pineapple juice, rice vinegar, brown sugar, ketchup, and soy sauce. Whisk until the sugar begins to dissolve.
Bring the mixture to a full boil, whisking occasionally. Continue boiling for 1-2 minutes until the sugar completely dissolves.
While whisking constantly, slowly pour the cornstarch slurry into the boiling sauce. Whisk vigorously to prevent lumps from forming.
Continue cooking and whisking for 2-3 minutes until the sauce thickens and develops a glossy sheen. Reduce heat to medium-low once it reaches desired consistency.
Remove from heat once the sauce coats the back of a spoon. Let cool for a few minutes before using, as it will thicken slightly more as it cools.
Notes
Use canned or bottled pineapple juice, never fresh - fresh pineapple contains enzymes that can break down the sauce texture.
Always mix cornstarch with cold water first to prevent lumps when adding to the sauce.
Whisk constantly while adding the slurry to ensure a smooth, glossy finish.
The sauce will thicken more as it cools, so don't over-thicken it on the stove.
Store in an airtight container in the refrigerator for up to 3 weeks.
Reheat gently on the stovetop or in the microwave, stirring frequently.
If sauce becomes too thick after refrigeration, thin with a tablespoon of water or pineapple juice.
For a spicier version, add 1-2 teaspoons of sriracha or red pepper flakes.
Substitute honey for brown sugar for a different sweetness profile.
Add 1 tablespoon minced ginger and 2 cloves minced garlic for extra depth of flavor.