It's a 'home made' feed made up of one part crunchy peanut butter, mixed with one part suet and two parts crushed peanuts. When mixed together it forms a putty like consistency which can then be packed into the 3/4" holes which I drilled into that bit of branch.What is the feeder it's on?
I can see white sunflower hearts and nuts but I'm not sure what that is.
Cheap brand crunchy peanut butter from a discount shop is about 45p per jar. Shredded beef suet is about £1 a box. It makes enough to fill that feeder about 4 or 5 times.