Forget grocery-store sushi! Whip up these rice "sandwiches" filled with cucumbers and cream cheese instead. They make an excellent post-game, study group, or tea party snack for the kids. The best part? You can prepare the whole thing in advance.
Line 8-inch-square glass baking dish with plastic. Toss warm rice with vinegar and salt in a large bowl. Firmly press half into dish. Spread with 1/4 cup cream cheese. Layer half the cucumber slices on top, overlapping. Repeat. Cover with plastic; top with a weighted baking dish. Refrigerate at least 2 hours or overnight.
Lift out; transfer to cutting board. Cut into 1-by-2-inch rectangles. Dip 1 short and 1 long side of each sandwich in sesame seeds. Serve within 4 hours.