Why do quick-frozen green beans sometimes taste bitter? Quick-frozen green beans manufacturers provide you with answers

The bitterness of quick-frozen green beans is mainly related to three core factors: variety maturity, improper storage, and cooking errors. The source of bitterness is either the substances in the green beans themselves, or harmful substances produced by deterioration or improper handling. The cause needs to be investigated first before judging whether it is edible. Quick-frozen green beans manufacturers provide you with answers.

1. Three core causes of pain

Variety or maturity issues: Naturally bitter, quick freezing cannot eliminate the problem. If green beans are not mature enough (too tender) or too old (fiber aging) when picking, they will accumulate more bitter substances, such as tannins and bitter glycosides. This type of substance is the plant's own defense component. Quick freezing can only lock in the flavor but cannot remove the original bitterness.

Over-aged green beans: the beans are hard, the fiber is thick, and the bitterness is more obvious;

Specific varieties: Some pea varieties are inherently less bitter, but if you purchase a more bitter variety, the finished product will also be bitter.

Improper storage: The release of bitter substances or storage deterioration are common causes of bitterness in quick-frozen green beans. Improper low-temperature storage can destroy the cell structure of green beans or breed microorganisms, resulting in a bitter taste.

Repeated thawing: thawing and then freezing will cause the green bean cells to rupture and release the bitter substances (such as tannins) originally wrapped in the cells, making the taste bitter;

The freezing temperature does not meet the standard: not below **-18℃ ** Stable freezing (such as the frost on the freezer layer of the refrigerator is too thick and the door is opened frequently), the green beans will slowly deteriorate, microbial metabolism produces bitter substances, and the color may turn yellow and dark;

Storage for too long: beyond the shelf life (or within the shelf life but stored for more than 6 months), green beans lose nutrients, oxidize and produce odor, accompanied by a bitter taste.

Cooking errors: Improper operation can cause bitterness. High temperature, heat or matching problems during cooking can also make green beans bitter. This kind of bitterness is mostly "acquired".

Burnt/scorched: Green beans have small particles and are easy to burn at high temperatures (especially when fried directly without thawing, the local temperature is too high), and the carbonization of carbohydrates will produce an obvious bitter taste;

Undercooked: Raw green beans contain anti-nutrients such as trypsin inhibitors, which are not only harmful, but also have a slightly bitter taste. The bitter taste will remain when not cooked thoroughly;

Mixing flavors with bitter ingredients: If cooked with bitter ingredients such as bitter melon, tangerine peel, and unsoaked dried kelp, green beans will absorb the bitter taste and become bitter themselves.

2. How to avoid eating bitter-tasting quick-frozen green beans?

When shopping: 3 steps to avoid “potential bitter beans”

Look at the packaging: choose products that are well sealed, frost-free, and not damaged. Frost indicates that they may be defrosted repeatedly;

Look at the color: Observe through the packaging. The green beans should be uniformly emerald green, without yellowing, blackening, or spots. If the color is dull, it may have been stored for too long;

Check the shelf life: give priority to products with a production date within 3 months, and avoid products that are close to expiration or expired.

While in storage: 2 keys to preventing spoilage

Sealing in portions: After opening, put into sealed boxes/preservation bags according to the "one serving amount" and squeeze out the air to avoid repeated thawing;

Stable low temperature: Place in an independent freezing layer (non-temperature-changing layer) of the refrigerator to ensure that the temperature is stable below - 18°C, and defrost the freezing layer regularly (frost exceeding 5mm will affect refrigeration).

When cooking: 3 tips for removing bitterness and adding flavor

Cook thoroughly: Cook green beans, whether thawed or not, until they are emerald green and have no raw flavor (3-5 minutes if not thawed, 2-3 minutes if thawed) to destroy bitter anti-nutrients;

Control the heat and prevent it from becoming mushy: Use medium-low heat when frying quickly, and stir frequently to avoid local overheating. You can add a little water and simmer for 10 seconds to prevent dry frying and becoming mushy;

Combination to remove bitterness: If you are worried about the slight bitterness, you can add a pinch of salt or a little sugar when cooking to neutralize the bitterness (except for babies).

3. Note: This type of bitter green beans must not be eaten!

If the green beans are not only bitter but also meet any of the following conditions, it means they have gone bad and contain harmful microorganisms. Eating them may cause diarrhea and vomiting and must be discarded directly:

Has a peculiar smell: in addition to being bitter, it also has a sour, sour, musty smell;

Abnormal texture: It feels sticky and soft, breaks into pieces when pinched, and has no crispiness;

Abnormal color: overall black, gray, or white mold spots.