I've used them in lemonade. The more purple the better. I've a wheat wine in secondary which I used a plastic shopping bag full. There's so much other stuff in the brew though that I can't say I taste the tunas.
How did you remove the glochids? I roll them in an old t-shirt until no more come off. Then, wearing heavy leather gloves, I slice them in half and spoon the insides away from the skin.
To remove the seeds, just so I don't have to deal with them being in the beverage, I smash the pulp through a wire basket type strainer and help it along with a little water from the sink sprayer. Those seeds are like little rocks.