Vegan Bulgogi Sandwich

Ingredients

• 2 large portobello mushroom caps (6 oz)
• 1 pkg sliced shiitake mushrooms (5 oz)
• 1/4 cup low-sodium soy sauce
• 3 cloves minced garlic
• 2 Tbs mirin
• 1 Tbs maple syrup
• 1 Tbs rice vinegar
• 1 Tbs gochujang
• 1 tsp toasted sesame seeds
• 1/2 tsp garlic powder
• 1/2 tsp ginger
• 1/4 tsp black pepper
• 1 Tbs gochugaru
• 1 Tbs freshly-squeezed lemon juice
• 2 tsp maple syrup
• green bell pepper
• tomato
• red onion
• scallions
• cilantro or parsley