We visited Latvia a few years ago and remember hearty food based around pork and potato, covered in sour cream and dill.
The potato pancakes were the easiest to make: 600g of grated raw potato, 1 egg, 5 tbsp flour and seasoning, mixed together and fried. These were ok but perhaps a bit dense.
The dumplings were much more tricky to make but worth the effort. I used a recipe from bellyrumbles.com
To make the dumpling wrappers you mix mashed (cooked) potato with grated raw potato, sour cream, egg, salt and pepper and mix together to form a dough. The filling is made from fried onion and bacon. You then parcel up a bit of the bacon mix inside the wrapper and form into a torpedo shape.
The dumplings are boiled for about 10 minutes then pan fried in butter. These were absolutely delicious!