Original: Traditionally, the weight ratio for mirepoix is 2:1:1 of onions, celery, and carrots; the ratio for bones to mirepoix for stock is 10:1.
Simplified: Traditionally, the ratio for mirepoix is 2:1:1 of onions, celery, and carrots. The ratio for bones to mirepoix for stock is 10:1.