Take steak out of fridge and bring to room temp, place steak on a plate and pat dry with clean paper towel.
Season steak generously with kosher salt and ground black pepper.
Bring large cast iron skillet to medium-high heat. Add ghee (or olive oil) and swirl to coat the pan.
Sear steak pieces on both sides, approximately 1-2 minutes per side (depending on thickness). You don't want to cook them all the way through, just sear them.
Remove from skillet and place on a plate; set aside for later.
Add broth to pan to deglaze the bottom; be sure to scrape up any bits that are stuck.
Add the garlic and move around the pan until fragrant, about 30 seconds
Add red onion, red bell pepper, curry paste, coconut milk, and lime juice. Use a whisk to combine.
Add beef back in along with any juices that have settled on the plate. Let simmer 5-10 minutes.
Meanwhile, cook your rice noodles according to their package instructions. Drain and set aside.
Add in basil to curry mixture; stir to combine.
Taste and add additional kosher salt, as needed.
Serve over rice noodles. Garnish with fresh lime slices and additional chopped basil.