Slice the beef into thin strips. Slice the onion and bell pepper, and trim the green beans.
In a large skillet or wok, heat the red curry paste over medium heat until fragrant (about 1-2 minutes).
Add the beef and stir-fry until browned on all sides.
Pour in the coconut milk, then stir in the kaffir lime leaves, lemongrass stalk, and fish sauce.
Add the brown sugar and simmer over low heat for 20-25 minutes, or until the beef is tender.
Add the sliced bell pepper, onion, and green beans, and cook for an additional 5-7 minutes, or until the vegetables are crisp-tender.
Remove the lemongrass stalk and kaffir lime leaves, then sprinkle with fresh basil.
Serve hot with jasmine rice and garnish with fresh basil leaves.
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