Blanching the green vegetables - I do a very quick blanching. This is to keep the greens still crispy and most of their nutritional values. To do this, I boil water in an electric kettle, pour the water into the bowl with the greens in it, soak for about 2 minutes, and immediately rinse with very cold water or ice water to stop the cooking. Then I transfer to a sieve to drain the water before searing.
The white wine sauce should come out with a strong flavor as it is going to cover the vegetables. So when you taste it, don't worry if it is too sour just check if needs seasoning.
The amount of oil and butter in cauliflower puree is of course optional, you can put less, but to get a creamier and smoother texture, add as much as needed. A vegetable oil would work here or also half olive oil and half vegetable oil. Not recommended to use only olive oil as it is overpowering.