Vegan Kimbap (aka Gimbap): Veggie, Rice, and Seaweed Roll

Name: Vegan Kimbap (aka Gimbap): Veggie, Rice, and Seaweed Roll
Cuisine: Asian, Korean
Ingredients: 2 cups short grain rice, cooked; 2 tsp. sesame oil; 1/2 tsp. salt; 1 portobello mushroom cap, sliced; 1 carrot, julienned; 2 cups spinach; 1 pkg. dried seaweed sheets (gim); 5 strips pickled daikon radish (danmuji); 1 cucumber, sliced lengthwise; 1 block cooked tofu, cut into strips (optional)