STEP3: Add in chopped onion, grated garlic, Italian seasoning, red pepper flakes, salt, blackpepper, and cook for 4 minutes, stirring occasionally.
Pour in the marinara sauce and simmer for 5 minutes.
STEP4: Cook 1 pound of pasta in 1 gallon of boiling water with 2 tablespoons of salt.Reserve one cup of pasta water, then drain the pasta, and toss it in the sauce until thoroughly coated (off the heat).