Let's cook.
In a medium bowl, whisk together the gochujang, soy sauce, sesame oil, rice vinegar, maple syrup, and minced garlic to create the marinade.
Add the pressed tofu cubes to the marinade, ensuring they are well coated. Let marinate for at least 15 minutes at room temperature, or up to 30 minutes in the refrigerator.
While the tofu marinates, thread the marinated tofu, bell pepper pieces, zucchini pieces, and red onion pieces alternately onto skewers.
Heat a grill or a large non-stick pan over medium-high heat. Lightly oil the cooking surface.
Place the skewers on the hot grill or pan. Cook for 10-15 minutes, turning occasionally, until the vegetables are tender-crisp and the tofu is lightly charred and cooked through.
Serve immediately with rice or your favorite side dish.
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