Mix both types of coconut in a large heavy pan.
Add Add milk and cook till bubbes appear.
Continue cooking, stirring continuously, for 10-12 minutes.
Simultaneously, boil sugar in 1/2 cup water to make 2-1/2 thread syrup. (refer sugar syrup)
Pour into coconut, stirring gently and continuously.
Add butter, and continue stirring, till a soft lump is formed.
Empty into greased large plate, pat even very lightly.
Cool and cut into squares.
Cool and set completely before transferring to container.
Store in airtight containers.