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Prepare the beef batter: In a medium bowl, combine the self-rising flour and 1/2 cup cornstarch. Gradually add 1/2 cup water, mixing by hand, until a smooth, thick batter forms. Adjust water as needed to reach a pancake-like consistency.

Add the velveted beef to the prepared batter. Mix thoroughly by hand until all the beef pieces are evenly coated. Ensure each piece is separated.

Prepare a tray or shallow dish with 1 cup of cornstarch. Transfer the battered beef pieces to the cornstarch. Mix the beef and cornstarch by hand, ensuring every piece is separated and fully coated. This step is crucial for crispiness.

Heat the frying oil in a wok or large heavy-bottomed pot over high heat until it reaches 350-375°F (175-190°C).

Carefully add the cornstarch-coated beef pieces to the hot oil in batches, ensuring not to overcrowd the wok. Fry the beef until it is crispy golden brown, about 3-4 minutes per batch. Maintain a high heat to ensure crispiness.

While the beef is frying, prepare the sweet and sour sauce: In a Pyrex measuring cup or small bowl, combine the ketchup, Worcestershire sauce, 1/4 cup water, granulated sugar, white vinegar, and red food coloring (if using). Stir well to mix all ingredients.

Once a batch of beef is crispy, add a portion of the chopped bell peppers and onions directly into the hot oil with the beef. Cook briefly for about 30 seconds to 1 minute, just until slightly softened but still crisp.

Using a large slotted spoon or spider, quickly remove the crispy beef and vegetables from the hot oil and transfer them to a wire rack set over a baking sheet to drain excess oil. Repeat steps 5 and 7 with remaining beef and vegetables.

Carefully pour out most of the frying oil from the wok, leaving about 1 tablespoon. Return the wok to medium-high heat. Pour the prepared sweet and sour sauce into the hot wok. The sauce will bubble vigorously.

Prepare the potato starch slurry: In a small bowl, whisk together 1 tablespoon potato starch and 2 tablespoons water until smooth. Add the potato starch slurry to the bubbling sauce in the wok, stirring continuously until the sauce thickens to a glossy, syrupy consistency.

Add the drained crispy beef and vegetables back into the thickened sweet and sour sauce in the wok. Perform a quick toss to coat all the beef and vegetables evenly with the sauce. Work quickly to maintain crispiness.

Serve the crispy sweet and sour beef immediately on a plate, ideally with steamed rice.

Prepare the beef batter: In a medium bowl, combine the self-rising flour and 1/2 cup cornstarch. Gradually add 1/2 cup water, mixing by hand, until a smooth, thick batter forms. Adjust water as needed to reach a pancake-like consistency.

Add the velveted beef to the prepared batter. Mix thoroughly by hand until all the beef pieces are evenly coated. Ensure each piece is separated.

Prepare a tray or shallow dish with 1 cup of cornstarch. Transfer the battered beef pieces to the cornstarch. Mix the beef and cornstarch by hand, ensuring every piece is separated and fully coated. This step is crucial for crispiness.

Heat the frying oil in a wok or large heavy-bottomed pot over high heat until it reaches 350-375°F (175-190°C).

Carefully add the cornstarch-coated beef pieces to the hot oil in batches, ensuring not to overcrowd the wok. Fry the beef until it is crispy golden brown, about 3-4 minutes per batch. Maintain a high heat to ensure crispiness.

While the beef is frying, prepare the sweet and sour sauce: In a Pyrex measuring cup or small bowl, combine the ketchup, Worcestershire sauce, 1/4 cup water, granulated sugar, white vinegar, and red food coloring (if using). Stir well to mix all ingredients.

Once a batch of beef is crispy, add a portion of the chopped bell peppers and onions directly into the hot oil with the beef. Cook briefly for about 30 seconds to 1 minute, just until slightly softened but still crisp.

Using a large slotted spoon or spider, quickly remove the crispy beef and vegetables from the hot oil and transfer them to a wire rack set over a baking sheet to drain excess oil. Repeat steps 5 and 7 with remaining beef and vegetables.

Carefully pour out most of the frying oil from the wok, leaving about 1 tablespoon. Return the wok to medium-high heat. Pour the prepared sweet and sour sauce into the hot wok. The sauce will bubble vigorously.

Prepare the potato starch slurry: In a small bowl, whisk together 1 tablespoon potato starch and 2 tablespoons water until smooth. Add the potato starch slurry to the bubbling sauce in the wok, stirring continuously until the sauce thickens to a glossy, syrupy consistency.

Add the drained crispy beef and vegetables back into the thickened sweet and sour sauce in the wok. Perform a quick toss to coat all the beef and vegetables evenly with the sauce. Work quickly to maintain crispiness.

Serve the crispy sweet and sour beef immediately on a plate, ideally with steamed rice.