If you don’t have double cream, use single cream or crème ... finely chop and add to the sauce at the same time as the pasta. You can also stir in dried chilli flakes, sliced fresh chilli ...
Process until a smooth, creamy sauce forms, 30 to 45 seconds. Return sauce to skillet. Add pasta and reserved cooking liquid to skillet; stir to coat with sauce. Simmer over medium, stirring and ...