Step 1

Combine all the marinade ingredients in a large ziplock bag, seal, and shake to mix well. Add the beef into the bag. Massage the bag a couple times to mix everything well. Squeeze out as much air as possible and seal the bag. Let marinate at room temperature for 1 hour. If you plan to marinate longer, store in the fridge for a couple hours, up to overnight.

Step 2

Combine all the sauce ingredients in a blender and mix until it forms a smooth sauce. If the sauce comes out too thick (depending on the density of the peanut butter you use), add 1 or 2 tablespoons more water and blend again. Transfer to a bowl and set aside.

Step 3

As you prepare to cook, thread the beef onto skewers.

Step 4

Preheat a grill over medium high heat until hot. Brush oil onto the grill gates and spread the beef skewers on top. Cook the skewers until both sides are charred, 2 to 3 minutes per side. Remove immediately and place on a serving plate. Garnish with chopped cilantro, if using. Scatter some chopped peanuts into the sauce to add texture. Serve hot with the peanut sauce.