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 ...
Put the silken tofu and soy sauce in a tall jug and add 3 tablespoons of the reserved pasta water. Use a stick blender to blend to a smooth sauce, then pour into the pan with the mushroom mixture.
I don't think any ratio variant could mess this up. The second sauce hack involved a lot of sour cream I've never made a pasta sauce with sour cream, and I was both worried and intrigued by ...
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 ...