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This recipe is broken down into three main components: the crispy tofu, the vibrant vegetables, and the secret-weapon stir-fry sauce.

For the Crispy Tofu:

1 (14-16 ounce) block of extra-firm tofu: It’s crucial to use extra-firm tofu, as it holds its shape best and contains less water, which is the key to achieving a crispy texture.
1 tablespoon soy sauce or tamari: This adds a first layer of savory flavor directly into the tofu.
2 tablespoons cornstarch: This is the non-negotiable secret ingredient for a light, crispy coating that stir-fry sauce will cling to beautifully.
2 tablespoons high-smoke-point oil (like avocado, canola, or grapeseed oil): Used for pan-frying the tofu to a perfect golden brown without burning.

For the Stir-Fry Sauce:

1/4 cup low-sodium soy sauce or tamari: The savory, umami backbone of the sauce. Use tamari for a gluten-free option.
2 tablespoons maple syrup or honey: Provides a touch of sweetness to balance the salty and tangy flavors.
1 tablespoon rice vinegar: Adds a bright, tangy note that cuts through the richness and lifts the entire dish.
1 teaspoon toasted sesame oil: A little goes a long way to add a deep, nutty, and aromatic flavor. Add this at the end of cooking to preserve its delicate taste.
1 tablespoon cornstarch: This acts as a thickener, transforming the liquid sauce into a glossy glaze that coats every ingredient.
1/4 cup water or vegetable broth: Used to create the right volume and consistency for the sauce.

For the Vegetables and Aromatics:

1 tablespoon high-smoke-point oil: For sautéeing the vegetables.
1 medium yellow onion, thinly sliced: Forms a sweet and savory base flavor when cooked.
1 red bell pepper, thinly sliced: Adds a pop of color and a sweet, fresh flavor.
1 cup broccoli florets, cut into bite-sized pieces: A classic stir-fry vegetable that soaks up the sauce wonderfully.
1 cup snap peas or snow peas: Provide a delightful crunch and fresh, green flavor.
2 cloves garlic, minced: An essential aromatic that provides a pungent, savory depth.
1-inch piece of ginger, grated or minced: Adds a warm, zesty, and slightly spicy kick that is characteristic of a great stir-fry.

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Follow these detailed steps to ensure a perfect stir-fry every time. The key is in the preparation—once you start cooking, things move very quickly!

Step 1: Press and Prepare the Tofu
This is the single most important step for achieving crispy, not soggy, tofu.

Remove the tofu from its packaging and drain all the water.
Place the tofu block on a plate lined with several paper towels or a clean kitchen towel. Place another layer of towels on top of the tofu.
Place something heavy on top, like a cast-iron skillet, a few cookbooks, or some canned goods.
Let the tofu press for at least 30 minutes, or up to an hour. You will be amazed at how much water is released.
Once pressed, cut the tofu into 1-inch cubes.
In a medium bowl, gently toss the tofu cubes with 1 tablespoon of soy sauce until they are lightly coated.
Sprinkle the 2 tablespoons of cornstarch over the tofu and toss again gently until each cube has a thin, even, dusty coating. Set aside.

Step 2: Whisk the Stir-Fry Sauce

In a small bowl or a liquid measuring cup, combine all the sauce ingredients: 1/4 cup low-sodium soy sauce, 2 tablespoons maple syrup, 1 tablespoon rice vinegar, 1 teaspoon toasted sesame oil, 1 tablespoon cornstarch, and 1/4 cup water.
Whisk vigorously until the cornstarch is fully dissolved and there are no lumps. This is crucial to prevent a clumpy sauce later.
Set the sauce mixture aside near your cooking station.

Step 3: Cook the Tofu

Heat 2 tablespoons of high-smoke-point oil in a large skillet or wok over medium-high heat. The oil is ready when it shimmers slightly.
Carefully add the cornstarch-coated tofu cubes to the hot pan in a single layer. Be sure not to overcrowd the pan; cook in two batches if necessary.
Pan-fry the tofu for about 5-7 minutes, turning the cubes every couple of minutes, until they are golden brown and crispy on all sides.
Using a slotted spoon, remove the crispy tofu from the skillet and set it aside on a plate.

Step 4: Cook the Vegetables and Aromatics

Using the same skillet (no need to wipe it out), add the remaining 1 tablespoon of oil if the pan looks dry.
Add the sliced onion and cook for 2-3 minutes until it begins to soften.
Add the broccoli florets and red bell pepper to the skillet. Stir-fry for 3-4 minutes. You want them to become tender but still have a slight crunch.
Add the snap peas and cook for another 1-2 minutes.
Clear a small space in the center of the pan. Add the minced garlic and grated ginger to this space and cook for about 30 seconds until fragrant. Then, stir them into the rest of the vegetables.

Step 5: Combine and Finish the Stir-Fry

Return the crispy tofu to the skillet with the cooked vegetables.
Give your prepared stir-fry sauce one final quick whisk to recombine the cornstarch, as it can settle at the bottom.
Pour the sauce all over the tofu and vegetables.
Stir everything together continuously for 1-2 minutes. The sauce will quickly bubble and thicken, coating everything in a beautiful, glossy glaze.
Once the sauce has thickened and everything is well-coated, remove the skillet from the heat immediately to prevent the vegetables from overcooking.
Serve hot and enjoy your masterpiece!