Suji rusk is very absorbent and doesn't disintegrate quickly when dipped in coffee. For ladyfingers we usually do a quick dip but with suji rusk, dip each side of the rusk well in the coffee, otherwise it will feel dry. I have used instant coffee powder, but you can brew 1 cup of very, very strong coffee or use a cup of expresso. If you want to use alcohol, mix in some coffee liqueur into the dipping coffee. I always had some filling left over as my dish was not very deep. If you are using a deeper dish than I did, then I recommend using 2 cups of heavy whipping cream instead of 1.5 cups. for a creamier tiramisu.
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