Grilled Mushroom Vegan Sushi

Name: Grilled Mushroom Vegan Sushi
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American, Japanese
Ingredients: 4 king trumpet mushrooms; 1 tbsp brown sugar; 2 tbsp coconut aminos (or sub. liquid aminos or soy sauce); 1 tbsp rice vinegar; 1 tbsp fresh ginger (grated); 1 tbsp fresh garlic (minced); 2 scallions (finely sliced); 1 cup sushi rice (or short grain rice); 1 cup water; 1 tbsp sugar (granulated or caster); 1/2 tbsp sea salt (fine); 2 sheets nori seaweed (cut into 1.5" strips (8 strips needed))