Preheat your oven to 400 degrees f.
To prepare the tomatoes remove the stem/core and discard, then cut them into quarters.
Place the tomatoes onto a large baking dish or tray, together with your jalapenos, and the garlic cloves.
Drizzle with oil and season generously with sea salt and freshly ground black pepper.
Roast in your preheated oven for 30-35 minutes, or just until everything is beginning to soften and things turn a nice golden brown on the top.
Once finished roasting, allow to cool for a bit.
Transfer all your roasted garden goodies to a high speed blender, or food processor together with all the juices from your baking dish.
Add in chopped onions, ground cumin and fresh cilantro leaves.
Pulse just until the salsa is almost smooth, with a bit of chunky texture, or whatever texture YOU love!
Taste test and adjust your seasonings if you want.
Transfer to a clean jar and refrigerate for up to 7 days, or freeze in freezer safe containers for up to 6 months.