The Last Supper took place during the feast of Passover. No special Hymns were sung to commemorate the Last supper itself. The hymns were most likely traditional Jewish passover hymns.

Prayers aren't recited during a meal (you don't pray while eating food). However, the standard prayers that relate to the foods about to be eaten (bread, wine, etc) are recited right before eating.

Skim milk, whole milk, half-and-half, whipping-cream and butter are all potentially kosher for Passover. The only difference between these is in the butterfat content (none in skim milk, almost 100 percent for solid butter).

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