The following piece of the CMoS explains rather well how to use quotes within quotes and reading what the manual says I conclude that, generally speaking, your assumption is correct; so you might write:
" 'delicious lasagna' " [note blank space separating single quotation mark from double quotation marks]
However, as others said, it depends on what you are writing.
13.28 Quotations and “quotes within quotes”¹
Quoted words, phrases, and sentences run into the text are enclosed in
double quotation marks. Single quotation marks enclose quotations
within quotations; double marks, quotations within these; and so on.
(The practice in the United Kingdom and elsewhere is often the
reverse: single marks are used first, then double, and so on.) When
the material quoted consists entirely of a quotation within a
quotation, only one set of quotation marks need be employed (usually
double quotation marks). For permissible changes from single to double
quotation marks and vice versa, see 13.7 (item 1); see also 13.61. For
dialogue, see 13.37. For technical uses of single quotation marks, see
7.50, 8.129.
“Don’t be absurd!” said Henry. “To say that ‘I mean what I say’
is the same as ‘I say what I mean’ is to be as confused as Alice at
the Mad Hatter’s tea party. You remember what the Hatter said to her:
‘Not the same thing a bit! Why you might just as well say that “I see
what I eat” is the same thing as “I eat what I see”!’ ”
Note carefully not only the placement of the single and double closing
quotation marks but also that of the exclamation points in relation to
those marks in the example above. Question marks and exclamation
points are placed just within the set of quotation marks ending the
element to which such terminal punctuation belongs. For the placement
of other punctuation—commas, periods, question marks, and so on—in
relation to closing quotation marks, see 6.9–11.
¹ Chicago Manual of Style. (http://www.chicagomanualofstyle.org/16/ch13/ch13_sec028.html) [You can register yourself for a thirty-day free trial here ]
