如何冷凍薯仔?

Don’t throw away the extra potatoes! It is more practical and economical to freeze them for later use. Perfectly freezing potatoes is easier than you think, but you do need to follow a few simple instructions. Here's what you need to know about freezing potatoes, whether whole, diced, mashed, fried or shredded:

Can you freeze potato chips?

Yes! You can absolutely freeze potatoes, and if you have extra potatoes, you should. But there's one important thing to remember: You should really only freeze cooked or parboiled potatoes, because raw potatoes contain a lot of water. This water freezes and makes the potatoes mushy and grainy when thawed.

Can you freeze potato chips?

How long can potatoes be kept?

It depends on how they are stored. Uncooked potatoes usually keep for two weeks at room temperature (never store raw potatoes in the refrigerator - this will ruin the texture), and cooked potatoes will keep in the refrigerator for about four days. However, frozen cooked potatoes will keep for about a year.

How to Freeze Potatoes

The best way to freeze potatoes depends on the type of potatoes you're using. Here's how to freeze whole potatoes, mashed potatoes, fried potatoes, and shredded potatoes:

Freezing whole or diced potatoes isn't difficult, but you do need to follow a series of simple steps.

  1. peel. This step isn't necessary, but it's helpful because blanching works best without the skin on. If you think you'll be able to mash the potatoes once they've thawed, now is a good time to cut them into cubes.
  2. Blanche. Fill the pot with water and season with salt. Place the pot over high heat and bring to a boil. After boiling, add the potatoes to the water. Blanching time depends on the size of the potato or potato pieces - blanching may take 3 minutes for small potatoes or cubes, or 10 minutes for a full russet. Remove the potatoes from the boiling water and immediately place them in an ice bath to stop the cooking process.
  3. Dry. When completely cool, transfer potatoes to a colander to drain. Once drained, place them in a single layer on a kitchen towel. Pat with paper towels to absorb excess moisture.
  4. Flash frozen. Place potatoes in a single layer on lined baking sheet. Freeze for at least four hours or up to overnight.
  5. freeze. When the potatoes are frozen, you can transfer them to date-labeled freezer-safe storage bags.

French fries or potato wedges

If your French fries are undercooked, you'll need to scald them before freezing (see instructions in the previous section). However, if they are cooked, the process is a little easier.

  1. Freeze first. Place the cooked (and cooled!) fries on a baking sheet lined with parchment paper. Freeze for at least four hours or up to overnight.
  2. Second freeze. Once the fries are frozen, you can transfer them to date-labeled freezer-safe storage bags.

Hash browns

Here's another thing, it depends on the state of the potatoes - are they cooked or raw? If the potatoes are undercooked, use the large side of a cheese grater to shred them before blanching (you only need to blanch them for a minute or two since they are already chopped). Cooked fries are frozen just like French fries.

  1. Freeze first. Place the cooked (and cooled!) hash browns on a baking sheet lined with parchment paper. Freeze for at least four hours or up to overnight.
  2. Second freeze. When the hash browns are frozen, you can transfer them to date-labeled freezer-safe storage bags.

Can you freeze potato chips?

mashed

Mashed potatoes freeze more easily than other types of potatoes because the fat in butter and cream helps maintain their texture. If you plan on freezing your soon-to-be-mashed potatoes, now is not the time to skimp on the good stuff.

  1. Cool. Make sure the mashed potatoes are completely cool before starting the freezing process.
  2. scoop. Spoon a small cup onto a baking sheet lined with baking paper.
  3. Freeze first. Freeze for at least four hours or up to overnight.
  4. Second freeze. When the potatoes are frozen, you can transfer them to date-labeled freezer-safe storage bags.

Mashed potatoes freeze more easily than other types of potatoes

Review

All comments are moderated before being published

HealthyPIG Magazine

View all
死亡氣味 :科學如何理解生命最後的氣息

死亡氣味 :科學如何理解生命最後的氣息

人類死亡後,身體嘅代謝同細胞運作會急劇改變,隨住時間推進,組織開始分解,產生一系列特有嘅氣味化合物。呢種 死亡氣味 (Odor of Death) 唔單止係動物可以嗅到,亦成為法醫學 (Forensic Science) 研究嘅重要領域。甚至有人提出,狗可能能夠嗅到人「臨終前」嘅早期氣味改變。

狗隻能否嗅出疾病甚至死亡?——從嗅覺科學到臨床研究

狗隻能否嗅出疾病甚至死亡?——從嗅覺科學到臨床研究

人類同狗相處幾千年,唔少人都曾經觀察到:狗似乎「知道」主人唔舒服,甚至有人報告狗會喺主人臨終前出現異常行為。呢啲現象令科學家開始研究:狗隻係咪真係可以嗅出疾病,甚至察覺死亡徵兆?

答案係:狗確實能透過超強嗅覺 (Olfaction) 偵測身體嘅代謝變化,從癌症、糖尿病,到感染性疾病。但關於「臨終氣味」嘅研究仍然有限,更多係臨床觀察。

幻覺:大腦點樣自己製造「假影像」

幻覺:大腦點樣自己製造「假影像」

幻覺 (Hallucinations) 並唔係靈異現象,而係一種 大腦自我製造影像或感覺 嘅過程。當冇外界刺激存在,但大腦卻產生「真實感受」時,就叫幻覺。研究指出,幻覺源於 大腦訊號錯亂神經傳導物質失衡,甚至同 睡眠失調 有密切關係。

心理學上的「預知錯覺」:點解我哋以為自己可以預測未來?

心理學上的「預知錯覺」:點解我哋以為自己可以預測未來?

好多時候,我哋都會有種感覺:「咦!我早就預測到會發生!」,甚至覺得自己擁有「第六感」。但從心理學角度睇,呢種「預知」其實並唔係超能力,而係 大腦嘅認知偏差 (Cognitive Biases)記憶錯亂 (Memory Errors) 造成。以下三個心理現象,最常被誤以為係「預知未來」

大腦嘅「預測功能」:點解我哋係一部預測機器

大腦嘅「預測功能」:點解我哋係一部預測機器

科學研究一直證實,所謂「超自然預知 (Precognition)」並冇可靠證據。但人類大腦本身卻具備一種極強嘅 預測功能 (Predictive Function)。從神經科學角度嚟睇,大腦其實係一部 Prediction Machine(預測機器),不停利用以往經驗去推測未來,再根據新收到嘅感官訊號作出修正。呢種能力解釋咗點解人類可以快速反應、避開危險,甚至提升學習同決策效率。

遲起身唔等於懶!夜貓同雲雀原來係基因決定

遲起身唔等於懶!夜貓同雲雀原來係基因決定

有啲人天生 早睡早起,朝早 6 點自然醒身,精神奕奕;但亦有人喺夜晚最有活力,凌晨兩三點先想瞓。呢種差異唔係單純習慣問題,而係與 Chronotype(睡眠型態) 有關。Chronotype 由基因 (Genetics)、年齡 (Age)、生活環境 (Environment) 一齊決定,直接影響你嘅睡眠時間、精神狀態同工作效率。

腦淋巴系統:大腦喺瞓覺時點樣「清垃圾」

腦淋巴系統:大腦喺瞓覺時點樣「清垃圾」

我哋成日聽人講「瞓覺可以休息大腦」,但其實睡眠唔單止係休息,仲係大腦清理廢物嘅關鍵時刻。近年神經科學發現咗一個重要嘅系統:Glymphatic System(腦淋巴系統),負責喺瞓覺時清除代謝廢物,包括同 阿茲海默症 (Alzheimer’s disease) 有關嘅 β-amyloid(β-類澱粉蛋白)。

睡眠不足與情緒健康:焦慮與抑鬱的隱藏推手

睡眠不足與情緒健康:焦慮與抑鬱的隱藏推手

好多香港人、台灣人甚至全球都市人,都認為「捱夜」只係令身體攰啲,但其實 睡眠不足對情緒健康影響極深。研究顯示,缺乏睡眠唔單止會令人心情差,仲係 焦慮 (Anxiety)抑鬱 (Depression) 嘅高危因素。對於 嗜睡症 (Narcolepsy) 患者,呢種風險更高,因為佢哋天生嘅睡眠結構失調,令情緒波動更加嚴重。

為何過度疲勞會令你進入「恐懼模式 」?

為何過度疲勞會令你進入「恐懼模式 」?

好多時候,大家經歷過捱夜、返工返學壓力大,會覺得整個人進入咗一種「生存模式 (Survival Mode)」:神經繃緊、疑神疑鬼、甚至有啲恐懼感。呢種情況唔只係心理作用,其實背後有大腦與荷爾蒙嘅科學解釋。