Roast red pepper if desired in a 400 degree oven for about 30 minutes or until it starts to brown
Boil pasta according to box instructions but undercook it slightly because it will continue cooking after drained. Usually 7- 8 minutes. Save at least a cup of pasta water for pesto and then drain and add pasta to a large bowl
Put all the pesto ingredients in a food processor and blend till smooth. Slowly add in water from pasta until pesto is a creamy consistency
Chop up tomatoes and red peppers and add to the bowl with pasta.
Stir in the pesto with the pasta. I like a lot of pesto to make sure pasta is coated. Then add in the arugula
Top with cheese if desired and then ready to serve!
Notes
This recipe makes quite a bit of pesto and if you don't want to use all of it you can place it in an airtight container and in the freezer for later use.