When life gives you lemons
Sometimes, in cooking, ingredients are interchangeable. You can sub in a parsnip for a carrot in your vegetable soup or apples instead of pears in your crumble. Variety is the spice of life, after all.
But you can only make orange juice with oranges unless there’s some secret method I’m unaware of. So, as straplines go, “Lemons, perfect for orange juice,” leaves a lot to be desired. In terms of catchiness, and also in terms of making sense and being true.