In a 3-4 quart saucepan, bring ½ cup coconut milk to a boil. Add curry paste and stir. Continue cooking over medium high heat, stirring until thick and bubbling.
Add the remaining coconut milk, broth, sugar, fish sauce, and lentils. Stir to combine and bring to a boil. Once boiling, cover, and reduce to a simmer.
Simmer ~20 minutes. Then add sweet potato and green beans and continue to simmer, uncovered. Continue to cook until vegetables are crisp tender and lentils are cooked through, ~8-10 total minutes.
Turn off heat and stir in the Thai basil and lime juice. Serve over quinoa, brown rice, or Jasmine rice, and add toppings to taste. Enjoy!