2 lb. radishes (about 2 bunches), tops and roots removed, scrubbed and cut into 1/8 in rounds
1/4 C. plus 1/4 tsp. pure kosher salt
1 1/2 C. 5% white vinegar
1 T. salt
1 tsp. black peppercorns
1 tsp. fennel seeds
1 tsp. mustard seeds

Combine 1/4 C. salt with 2 1/2 C. water. Stir to dissolve (warm water helps). Put radish rounds into a bowl and pour salt water over. Refrigerate for 8 hours or overnight. Drain and rinse. In a large 6-8 quart pot, combine vinegar, sugar, 1/4 tsp. salt and spices. Bring to a boil, stirring to dissolve salt and sugar. Add radishes and return to a boil. Remove from heat. Pack hot canning jars loosely with radishes and brine. Leave 1/2 in headspace. Process jars in water bath for 10 minutes. Remove from water bath and leave jars undisturbed for at least 12 hours. Check if jars are sealed. Label sealed jars and store.