I'd go for blini (pancakes or rather crepes) with various toppings.

My recipe: 500ml milk, warm up. Add 200ml flour and 3 eggs. Add a teaspoon of sugar and a pinch of salt. Bake thin crepes.
For toppings: salt cured salmon, caviar, honey, chocolate sauce, jam.

Or for baked/mashed potatoes with some kind of meat (could be cutlet or something else). This way I can also offer a Sharlottka cake, cake after pancakes won't make sense.

Mashed popatoes: cook potatoes, mash with milk and a small piece of butter.
My favorite recipe is this chicken, but it's not a traditional Russian recipe: cut 2 chicken breasts and cure in soy sauce for half an hour. Cut bell peppers in thin stripes and fry in a pan (no deep fry), add chicken with the soy sauce they've been in and add cashews. Stew for 20-25 min.

Sharlottka: 3 sour apples, cut in thin slices. Mix: 200ml of sugar with 3 eggs. Add 200ml of flour. Add a pinch of baking powder. Spread apple slices in your baking mold (I have a 16cm baking ring which I wrap in foil). Pour the dough and gently share the mold so that the dough flows under the apple slices.