butterleaf en · NOUN
Etymology
From butter + leaf.
Meanings
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(attributive, often, uncountable) A kind of lettuce with a delicate buttery flavour.
This will not be a problem if you use a butterleaf lettuce like Bibb, or possibly the inner leaves of romaine or cabbage (it depends on the particular head).
2008 April 9, Mark Bittman, “Quickly and Easily, a Touch of Elegance”, in New York Times: