I have a question about the recipe "Aunt Mariah's Lemon Sponge Cups" from ENunn. Can I substitute grapefruit for lemon in this?
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Absolutely! Any citrus should work. However, bear in mind that a grapefruit is likely to have a great deal more juice in it than a lemon (the recipe calls for 1 lemon). After some searching, I found that the average lemon contains about 3 tablespoons of juice. So, I would use 3 tablespoons grapefruit juice plus the grated rind of half the grapefruit.
Definitely will work, though my first substitution would probably be orange