Cooling/Resting Time: 0 minutes
Heat canola oil in large cast iron skillet over medium-high heat until shimmering.
Add sliced onions and cook 3-4 minutes, stirring occasionally, until light golden brown around edges.
Add bell pepper strips and salt.
Sauté 10-12 minutes, stirring occasionally to allow charring.
Turn off heat when peppers are tender-crisp.
Drizzle with soy sauce and serve immediately.