Bread, cheese, mayonnaise, bacon, some veggies and ketchup – well, this must be the ideal recipe for a yummy sandwich for you, but according to a leading UK chemical engineer, the secret ingredient that would make a perfect sandwich is – bubbles.

While speaking at an Institution of Chemical Engineers’ (IChemE) lecture, Professor Grant Campbell said that bubbles in bread are as important for making a good sandwich as its filling, due to the unique composition of wheat.

“Bread is special because of its bubbles. It’s got these bubbles because wheat, when mixed with water, salt and yeast.

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