crisphead
Can you pick up some iceberg and a cucumber when you go shopping, please.
The lettuce used in burgers is almost always iceberg, because it adds a pleasant crunch.

SMART Vocabulary: related words and phrases

Types of vegetable
alfalfa
allium
Anaheim
artichoke
arugula
crisphead
crookneck
cruciferous
cucumber
cuke
mooli
napa cabbage
neep
new potatoes
nopalito
serrano
shallot
shiitake mushroom
shishito
shiso

Examples from literature

Nobody lives in Antarctica, except for a few scientists, but people still visit the spectacular landscape of ice, snow, glaciers, and icebergs from the comfort of a cruise ship! 
Only 10 percent of an iceberg is above water. 
These big pieces of ice are called icebergs. 
This makes icebergs very dangerous for ships, like the Titanic! 

iceberg | American Dictionary

iceberg
noun[ C ]
us/ˈɑɪs·bɜrɡ/
a very large mass of ice that floats in the sea

Examples of iceberg

iceberg
Although the courts only take the tip of the dispute iceberg, they claim that they have already done their part.
As is increasingly common in ambitious projects of this nature, the published book is merely the tip of the iceberg.
The text of the constitutions was merely the tip of an iceberg of common law, legislative compromise, judicial decision, and extra-governmental practice.
This is just the tip of the iceberg for cognitive archaeology, however, because such conceptualization is by no means sufficient for actual tool production.
This means of transmission represents the tip of the iceberg as far as technology goes.
This tells us that realism is just the tip of the iceberg.
I reached a big iceberg that seems stranded.
But this is only the tip of the iceberg when it comes to institutional complexity in the welfare field.
The first iceberg, a large tabular berg, had already been spotted at 0410.
On occasion, icebergs were embedded in those floes.
These examples represent only the tip of the iceberg.
Cardiovascular accidents are rare because the exercise is self-paced, but minor orthopaedic events are reported and these are probably the tip of the iceberg.
Indeed, and true to the architects' terminology, how may a correlation be made between this iceberg-like character and its surroundings?
This figure, however, represents only the tip of the proverbial iceberg.
The risks of oil spill in both areas are increased by sea conditions and the presence of sea ice and icebergs.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.