Problembeginnerdraft
Green vegetables turn grey
Also searched as: olive-green broccoli, grey beans, grey peas, dark spinach

In short: Acid and time have turned the into an olive-brown pigment.
Picture it
Like a freshly painted garden fence weathering: heat and acid turn green into olive grey in minutes.
What happened in your kitchen?
Question 1
How long did the vegetables cook?
All causes, by frequency
3
- Cooked too long
The longer it cooks, the more acid leaks out and dulls the green.
Next time: Cook briefly, 1–3 minutes · Refresh in cold water straight away
- Acid too early
Lemon, vinegar or tomatoes in the pot speed up the colour change.
Next time: Add acid only when serving
- Kept warm in the sauce
Even after cooking, warmth keeps changing the green.
Next time: Cook the vegetables separately and mix just before serving
Related entries
Sources · 2
- Education Bureau Hong Kong: STEM – Fruits and Vegetables
- Harold McGee: On Food and Cooking (2004), Kapitel Gemüse, Eier