The easiest way to make noodles that resemble spaghetti or fettuccini is to use a spiralizer. It's a kitchen tool that often comes with a variety of blades which allow you to make noodles of different sizes and shapes. I use a simple spiralizer that only has three blades to make thin noodles, thick noodles and ribbons. If you don't have a spiralizer it's more difficult to make noodles but you can use a peeler to make noodles on longer firm vegetables such as zucchini, carrots and cucumbers.