do something from scratch

from scratch

Entirely without the aid of something that is already prepared or in existence. Refers to making something, usually food, from the raw or base ingredients or components, rather than those that have been preassembled or already partially completed. She doesn't have time to make cupcakes from scratch, so I'm sure they're from a box. My template got deleted so now I have to craft the whole report from scratch. If you want some real from scratch cooking, try Jesse's Café—it's as close to homemade as it gets.
See also: scratch
Farlex Dictionary of Idioms.

do something from ˈscratch

do something from the beginning, not using any work done earlier: The fire destroyed all the plans. Now we’ll have to start again from scratch.
See also: scratch, something
Farlex Partner Idioms Dictionary
See also:
  • (you) wanna make something of it?
  • all for the best
  • a bird in hand
  • a bird in the hand
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • all right
  • (do) (you) want to make something of it?