I use a basic rub. It works great, those sort of look like culotte steaks, aka tri-tip steaks.
Basic Meat Rub
three parts Kosher salt and medium grind black pepper
1/2 part granulated garlic, granulated onion, paprika, chile powder
pinch of sugar
Mix all together and apply to steak. Grill. If you want to get a little fancy, omit the garlic and onion granules. Make a slurry of garlic, onion, Worcestershire sauce and some parsley, add the rub and slather it all over the steaks. Then grill.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."