Subs sandwiches, especially when stuffed properly, are one of those busy messy foods that you need to eat with both hands. Like Felafel it needs full-contact, total engagement. This is no finger food, you need both hands to keep it under control.
Sometimes our Judaism can be like picking from a buffet, or tasting with a couple of fingers. Sub/Felafel Judaism means that we are fully engaged and invested, it requires all of our focus and attention.
The Hebrew word for hand is “Yad” and the numerical equivalent Gematria of Yad is 14. Two hands makes 28. The Hebrew letters that spell 28 are Kaf and Ches, which spell “Koach” which means strength.
The two hands implies strength. As it says in the Shema, “Bchol Me’odecha!” with all our might, with everything we’ve got!