She can give the example of Grains and legumes because when they combine we get all essential amino acids.
What are complementary Proteins ?
Protein complementation is most effecticient to get all 9 amino acids into a vegetarian diet. When combination of two vegetable protein takes place to get all 9 essential Amino acids for your body.
Grains and legumes , legumes and nuts , nuts and vegetables, vegetable and grains when they combine with we get all essential Amino acids like Tryptophan, lysine, valine ,threonine , phenylalanine, histidine , isoleucine, leucine are the Amino acids which are not produce in the body we have take it from outside.
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