Sweetcorn

The tassels should be chocolate brown, peel back the leaves to a nicely formed kernel and puncture with a finger nail. If the resulting liquid is clear, it's too early, if its milky it's just right if it's creamy then you might get away with it but you're pushing your luck, if it's thick and starchy it's well gone over. Depending on variety, I mostly grow Swift, the kernels start to go pale yellow and increase in yellow colour as time goes by. Make sure you jab a proper kernel rather than those at the tip which can be unpollinated.