I want to go to a self-service restaurant. Because we can eat what we like. But eating such a meal is also quite expensive.
They tell you not to start a sentence with a conjunction for several reasons. It creates a sentence fragment instead of a sentence. It makes the passage choppy.
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They tell you not to start a sentence with a conjunction for several reasons. It creates a sentence fragment instead of a sentence. It makes the passage choppy. It distracts the reader, who will all too often think "Why did the writer do that?" It often suggests unintended import. Your passage above illustrates all those flaws. You want:
"I want to go to a self-service restaurant because
anonymousI want to go to a self-service restaurant because we can eat what we like, but eating such a meal is also quite expensive.
Correct as shown above.
Also, here's another way you could write it:
We should go to a self-service restaurant because