Put half of your butter (or olive/ coconut oil) in your pan and put it in medium-high heat until it melts and gets hot.
Rinse your frozen peas and vegetables with cold water for 1-2 minutes until they are defrosted.
Add your sliced onion in the pan and sauté for 2-3 minutes.
Add your peas (and vegetables) and the corn in the pan and stir them for 5 minutes.
Now it's time to add the rest of the butter, lemon, spices, and herbs and cook them for 5 more minutes.