Place the dry soy chunks in a bowl and cover with hot vegetable broth; let soak for 10 minutes until softened.
Drain the soy chunks and squeeze them firmly with your hands or a kitchen towel to remove as much excess liquid as possible.
Heat the sesame oil in a large skillet or wok over medium-high heat.
Add the rehydrated soy chunks to the skillet and sear for 5-6 minutes, stirring occasionally, until the edges are golden brown and slightly crispy.
Add the broccoli florets, sliced red bell pepper, and snap peas to the pan, stir-frying for 3-4 minutes until the vegetables are tender-crisp.
In a small jar, whisk together the tamari, rice vinegar, minced ginger, minced garlic, and red pepper flakes.
Pour the sauce over the soy chunks and vegetables, tossing constantly for 1 minute until the sauce thickens slightly and coats every piece.
Remove from heat and garnish with sesame seeds before serving hot.