Add the spinach, olive oil, lemon juice, Parmesan, and seeds to a blender.
Blend very well until very smooth, stopping to scrape down the sides of the bowl or using the stick that came with the blender as needed. You can also do this in a food processor.
Season to taste with salt if needed.
Use with a pound of pasta, as a topping for pizza, or however you like!
Notes
Store in an airtight container in the fridge for up to 3 days or in a zip-top freezer bag, with as much air removed as possible, for up to 3 months. Thaw in the fridge or at room temperature to use.
Use a blender or food processor depending on what you have and what you prefer to use.
Blend the mixture well so there are no noticeable chunks of any ingredient.
Stop and scrape down the sides of the bowl to ensure the mixture is evenly blended.