Mark's Secret Salsa

1 28 ounce can crushed tomatoes
1/4 onion, diced
1 serrano, diced
1/3 bunch cilantro 
1/2 lemon juice
1/2 teaspoon olive oil 
1 teaspoon salt 
1/4 teaspoon black pepper 

Put all ingredients in the blender and blend on medium speed for about 20 seconds. pour in a larger glass jar or glass container and store in refrigerator over night before eating to blend flavors together. Keep refrigerated.