Oil-free Seed Mayo

We prefer to use seeds over cashews, so we thought we would give a sunflower/pumpkin seed mayo a try,

Ingredients:
1/2 cup sunflower seeds, soaked 2-4 hours, drained, rinsed and drained
1/2 cup pumpkin seeds, soaked 2-4 hours, drained, rinsed and drained
6 TBS lemon juice or the juice of 2 lemons
2 TBS agave
1 tsp onion powder
1 clove garlic
3/4 tsp salt
a couple of grinds of pepper
1 cup water