Saute the corn in a dry pan (no oil) over high heat regardless of whether you are using fresh or frozen. This just brings out the flavors.
Add the sugar, salt and pepper. The salt will likely draw out moisture, so continue to cook until the liquid is nearly absorbed.
Whisk together the cornstarch and room temperature water until there are no lumps. Add to the corn, stirring constantly. Allow to cook for 1 minute.
Add the almond milk and allow to cook until thickened.
Taste for seasoning, adding salt or pepper as needed.
If re-heating and it's too thick, simply add more almond milk.
Garnish with fresh parsley prior to serving.