Using a food processor, process the seeds into a fine powder.
Transfer the powder to the blender, add water, and puree until completely smooth.
Pass through a cheesecloth or nut bag. Transfer the milk to a medium saucepot.
Heat the milk over low heat, while stirring constantly. The milk will slowly begin to curdle. With a slotted spoon remove the curds and let them drain on a cheese cloth lined strainer.
Heat oil in a large skillet over medium-low heat. Add onion and cook until tender, 5 to 6 minutes. Add cilantro and cook for 1 more minute. Add the curds and cook until warmed through. Season with salt and pepper to taste.
Serve on warm corn tortillas with your favorite salsa.