Prepare the Lemons: Quarter the lemons and remove seeds. Keep peel for texture or remove for smooth paste.
Blend Ingredients: Add lemons, salt, sugar, olive oil, and garlic (if using) to a food processor. Blend until smooth.
Adjust Consistency: For a thinner paste, add 1–2 tablespoons of water. For a chunkier texture, blend less.
Taste and Adjust: Add more sugar or salt if needed to balance tartness.
Store: Transfer the paste to a clean jar. Refrigerate for up to 3 weeks or freeze in small portions for up to 3 months.