You need some liquid in it too, BM/formula/water. As above I'd make a big batch then freeze as ice cubes that way it'll last you ages.
We use a nutra bullet to blend ours and works wonders comes out completely smooth
We add some formula or water from what the veg cooked in to thin it down. I also started with a hand blender and it left it really chunky no matter how much I blended so we bought a magic bullet and it’s so much easier! It was £30 on amazon. We then use silicone ice cube trays to freeze it 🙂
My HV has said to blend it with a hand blender and then freeze them into little cubes to save time instead of making them each time