Select the correct words for the blanks in the following sentence.
Your recipe could use _________ ingredients and _________ salt.

“Fewer” refers to things that can be counted. Use “fewer” before plural nouns (fewer ingredients).
“Less” refers to degree or amount. Use “less” before singular nouns (less salt).
More examples:
There were fewer dogs at the park today.
We pay less rent than our friends.
He saw fewer animals on the safari than he expected.
She saw less wildlife on the safari then she expected.