Round steak is kind of tough if you don't cook it long enough and tenderizing it helps, too. Swiss steak is my favorite way to prepare round steak. Here's how make it:
1 pound round steak
1/4 cup all-purpose flour
1 teaspoon salt
1/4 teaspoon fresh cracked black pepper
3 tablespoons vegetable oil
1/2 cup chopped onion
1 can (14.5 ounces) diced tomatoes
3 tablespoons chopped green bell pepper
Cut steak into serving-size pieces. Combine flour, salt, and pepper; pound into round steak with meat mallet. In a large skillet, brown meat in hot oil. Add onion, bell pepper, and tomatoes; cover and cook swiss steak over low heat for 1 1/2 hours, or until tender. Serve with noodles, rice, or smashed potatoes.
Sometimes I use a can of stewed tomatoes, which already contain onion and bell pepper, instead of plain diced tomatoes and chopping my own onion and bell pepper.