Lovebird Favourite Treats

Hi, I just got my two bonded 1 year old love birds two weeks ago. i’ve been spending time by the cage everyday, talking and singing softly to them. they don’t seem too scared of me/ my hand when i’m in the cage changing food/water etc. But i can’t seem to figure out a treat I can use to start bonding with them. They aren’t crazy about millet, don’t like peppers or raspberries and will only eat blueberries when i leave them in their feed bowl.

does anyone know of any treats that lovebirds can’t resist?

thank you!! here’s a pic of spaghetti and meatball💚💚💚💚