Here's a typical carne asada marinade used by Lisandro "Chando" Madrigal, the proprietor of Chando's Tacos, when he's grilling at home.
This is just a base recipe, so let your taste buds be the guide. Other ingredients to consider include: paprika, black pepper, chili powder, dried onion, garlic salt, soy sauce, slices of orange, and beer as a liquid base. This marinade is enough for 3 pounds of steak.
3 tablespoons seasoned salt
1/2 onion, sliced in rounds
1/4 cup diced cilantro
1/2 cup orange juice
Cover the bottom of a Tupperware container with a few slices of steak. Season with salt, top with a few slices of onion and cilantro, and drizzle enough orange juice to cover. Repeat this process with additional layers of steak. Marinate for two to three hours before grilling.