Do not use a deep pot, over medium heat, heat the 1/4 c of olive oil.
When it is hot, add the garlic.
As soon as garlic is sizzling (do not let it brown), add the tomatoes from the reserved bowl, then add the tomato water.
Add whole chile or red pepper flakes, oregano (if using) and salt. Stir.
Place basil sprig, including stem, on the surface (like a flower). Let it wilt, then submerge in sauce.
Simmer sauce until thickened and oil on surface is a deep orange, about 15 minutes.
If using oregano, taste sauce after 10 minutes of simmering, adding more salt and oregano as needed.
Discard basil and chile (if using).