Bitter oranges

Without reading the information carefully, Emily dragged these discounted oranges into her basket, feeling excited that she could enjoy the luxury of burst oranges. However, she tasted the bitterness when at home.

The tag said 'For cooking only'. Poor Emily, it was not due to her language deficiency, though. I also heard the name the first time after living in the UK for years. I know that there are cooking apples which are often seen in markets.

Well, time to taste the difference after searching for recipes.