Show some checkboxes for each component:

e.g. something like this...

db.define_table('ingredient',
    Field('name','string',length=100),
    Field('kind',requires=IS_IN_SET(['alcohol','mixer','garnish']),
    format='%(name)s',
    )

Table Drink ...
    Field('ingredient_garnish','list:reference ingredient',label='Garnish 
List',length=100,
        widget=lambda f, v: SQLFORM.widgets.checkboxes.widget(f, v, 
style='divs')),
    ....

db.drink.ingredient_garnish.requires=IS_EMPTY_OR(IS_IN_DB(db(db.ingredient.kind=='garnish')
 
,db.ingredient.id,'%(name)s',multiple=True))

I don't have time to adapt to your models etc but I thought the above might 
be of interest for you to experiment.

Regards,
David

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