Step 1

For the chicken: Place your broccoli florets in a medium bowl and add 2 tablespoons water. Cover with plastic wrap and microwave for 2 minutes, until tender. Drain and set aside until ready to use.

Step 2

Heat the oil in a 4-quart (3.8-liter) Dutch oven to 375 degrees F (190 degrees C) using a frying thermometer. Rinse the chicken in cold water and pat dry with paper towels. Mix 1 1/2 cups (335 grams) of the tempura flour and 1 cup (240 milliliters) water into a thick batter. It should look like thick pancake batter. Dredge the chicken cubes in the 1 cup (223 grams) of tempura flour and then coat them in the batter. Fry them in two batches until golden brown and crispy, 6 to 8 minutes. Drain the chicken on paper towels or a rack.

Step 3

Heat a wok or large skillet to high and add 2 tablespoons (30 milliliters) of oil. When you see the first wisps of white smoke, stir in the fried chicken, onion, chiles, broccoli, and 1/3 of the ginger and garlic and cook them for about 30 seconds.

Step 4

For the sauce: While the chicken cooks, add the oyster sauce, hoisin sauce, chili garlic sauce, sugar, white vinegar, soy sauce, cornstarch slurry, red food coloring if using, 1/3 cup water and the remaining chopped ginger and garlic into a 1-quart (946-millileter) saucepan and bring the heat up to medium. Whisk gently as it comes to a simmer. Allow it to simmer and keep whisking it for about 5 minutes, until the sauce thickens. Remove from the heat and reserve it.

Step 5

Stir in the sauce and allow it to coat the chicken and simmer. Cook it, folding all the ingredients until they are well coated, about 2 minutes. Garnish with the scallions.