Transfer the tomatoes to a small, 1-quart baking dish.
Roast the tomatoes until they are soft and beginning to burst, about 20 minutes. Let them rest for 5-10 minutes, garnish with chopped parsley (if using), and serve.
2 tablespoons parsley
Video
Notes
If using any salt other than Diamond Crystal Kosher Salt, including Morton kosher salt, use half the amount listed.
Seasonings, especially salt, are guidelines. Adjust to taste.
There's no need to peel and/or slice the tomatoes before cooking them.
The tomatoes taste better after they've had a chance to rest. So, while it's OK to serve them immediately, it's best to let them rest for 5-10 minutes before serving. You can also serve them after they've cooled to room temperature.
The leftovers keep well in the fridge, in an airtight container, for 3-4 days. Gently reheat them, covered, in the microwave or serve them cold like antipasti.