Pickled Peppers

3 cups of sliced assorted peppers
2 medium cloves garlic, smashed
1 tbsp black peppercorns
1/2 tsp mustard seed
1 1/4 cup boiling water
1 tbsp pickling salt
1 1/4 cup white vinegar

Add the peppers, garlic, peppercorns, and mustard seed to a clean quart-sized mason jar. In a separate jar, combine the boiling water and salt. Once the salt has dissolved and the water has cooled to room temperature, add the vinegar. Pour the vinegar solution over the peppers and seal the jar. Refrigerate for at least 4-5 days before serving.