Don't have a food processor or blender? Don't let that stop you from making tomato sauce! This time-tested method requires the bare minimum of tools.

Add Yahoo as a preferred source to see more of our stories on Google. Food & Wine / Dave Benett / Getty Images Although it seems simple, a humble batch of tomato sauce can be made in countless ways.

For anyone who is new to clean eating it is preparing foods that are not processed with lots of added sugars and salt. The focus is on a variety of fresh fruit, vegetables, whole grains and lean meat.

Mark Bittman, author of "Mark Bittman's Kitchen Matrix" shares the master recipe for his easy, three-ingredient tomato sauce, plus eight different ways to jazz things up. Put 3 tablespoons olive oil ...