Add butter to a medium pot or large shallow pan over medium-high heat. Once melted, add the onions, white part of scallion, garlic and ginger, and cook for about 3-5 minutes.
Add the gochujang, gochugaru and sugar and cook for about 2 minutes until caramelized.
Add the lentils, broth, coconut milk, salt and pepper and stir to combine. Bring to a boil and reduce heat and simmer for 18-22 minutes, or until lentils are soft and becomes thick.
Drizzle in soy sauce and stir to combine.
Serve with rice, lime juice, cashews, cilantro and scallion tops. Enjoy!!
