Solution
Ingredient 6

To solve this puzzle stretch and                                (23)
That special corner of your                                     (16)
Where words that make a pleasing                                (22)
When put together can be                        .               (7)
The couplets' ending words must                 ,               (17)
And don't forget to stay in                     :               (25)
Be sure that you form perfect                   ;               (25)
Four iambs help you keep the                    .               (2)
Now add the numbers on the                                      (20)
To letters that are out of                      .               (8)
Put them together and you're                    .               (10)
See, wasn't that a lot of                       ?               (24)