Trim & peel the carrots; cut them lengthwise into quarters & chop the quarters.
Trim & peel the kohlrabi; cut it into slices (about 5-6 mm) & chop the slices.
Trim the spring oinions & peel if necessary; cut them lnegthwise & chop.
Put everything in a pot, cover w/ water, add salt & bring to a boil.
After about 8-10 min add the frozen peas; bring it to a boil again & let it boil for about a minute. Drain in a colander.
In the meantime (when the 1st part is boiling!) peel & trim the potatoes; chop them like the carrotts i. e. same size.
Put the potatoes in a pot, cover w/ water, add salt & bring to a boil.
Trim & chop the mushrooms.
Add the chopped mushrooms to the potatoes after 5 min of boiling & boil for about 10 min. Then drain in the same colander.
Mix the cooked vegetables & store in an airtight container in your fridge.