Spicy Mushrooms with Water Dropwort (버섯 미나리 초무침)

Ingredients:

1/3 an English cucumber, sliced in 3 to 3 1/2 inch long and thin strips
½ medium carrot, peeled, and sliced in 3 to 3 1/2 inch long and thin strips
½ a medium-sized onion, sliced thinly
1½ teaspoons salt
½ pound king oyster mushrooms (5 to 6 large king oyster mushrooms), cut into thin strips lengthwise
1 bunch of water dropwort (minari): about 2 ounces, with the tough stems and leaves trimmed off
¼ cup hot pepper paste (gochujang)
1 tablespoon hot pepper flakes (gochugaru)
2 garlic cloves, minced
1 tablespoon honey
3 tablespoons white vinegar
2 teaspoons sesame oil
1 green onion, chopped
1 green chili pepper (or jalapeno), stemmed, and chopped