Peel the frozen tomatoes

• Run the frozen tomatoes under hot water until the skins slip right off.
• Discard the skins and set the peeled tomatoes aside.

Sauté the aromatics

• Dice the onion and peel the garlic cloves.
• Sweat the onion and garlic in a large pot until softened and fragrant.

Simmer the sauce

• Add the peeled tomatoes and the fresh basil to the pot.
• Bring to a boil, then lower the heat and simmer until the sauce has reduced by half, stirring occasionally.

Fill the jars

• Ladle the hot sauce into clean jars, leaving a little headspace.
• Wipe the rims, place the lids and gently tighten the bands.

Process in a boiling water bath

• Lower the filled jars into a pot of boiling water, fully covered.
• Process for 40 min, then lift out and let cool completely before storing.