Tarka is an Indian technique for building flavor into a dish by heating seasonings in fat. This one features ingredients that are more European than South Asian. It’s the perfect counterpoint to mashed or roasted starchy vegetables, such as potatoes, sweet potatoes and winter squash. It also is delicious stirred into a bowl of beans or spooned over lentils. Use a mortar and pestle or the back of a small skillet to crush the caraway seeds.