In a small saucepan over low heat, melt the unsalted butter. Add the minced garlic and sauté for about 2 minutes until fragrant. Do not let it burn.
Remove the saucepan from heat and stir in the chopped parsley, cilantro, sea salt, black pepper, paprika, and lime juice. Set aside.
Preheat your grill or grill pan over medium-high heat. While it heats up, season the flank steak on both sides with salt, pepper, and paprika.
Once the grill is hot, place the steak on it. Grill for 6-7 minutes on each side for medium-rare, depending on the thickness of the steak. Use a meat thermometer to check for doneness; it should read 130°F (54°C) for medium-rare.
When the steak is done, remove it from the grill and let it rest for about 5 minutes. This helps retain the juices.
Slice the steak against the grain into thin strips. Arrange the slices on a serving platter and drizzle generously with the garlic butter mixture.
Serve with additional lime wedges and garnish with extra chopped herbs if desired.