I use frozen peas Birdseye ones to be specific. Look on the back and make sure the ingrediants JUST list peas not salt. I had to look through a million bags before I found one hee hee.
Ok for cooking *puts on her betta chef hat* I use a 1/2 cup plastic, microwave safe, measuring spoon. I use it only for cooking things for my little men. I add about 6 peas and fill it half way with water. I have a strong microwave so I only cook them for about 8 seconds or else they start to pop all over.
When I take them out I drain the water and let them sit for about 10 minutes. Take the pea and give it a little squeeze and the yummy center part should pop out. Dont worry you will get good at it.
Then I just use my finger nail to tear off a small piece about the size of their mouth. You would be suprised what they can suck down!
Put the pea on the end of your finger, when you touch your finger to the water the pea will fall right off. The great thing is that eventually you can use this to show them other foods to keep missed food out of the bottom of your tank.
Just drop and point and they will follow your finger.
There you go! Now your bettas will have happy tummies.
Oh yes dont be suprised if they attack your finger after a while. Horizen hops out of the water to nibble on mine all the time now. LOL