1. Make the relish. Combine the green pepper, cucumber, onion and 1/2 cup of the apple cider vinegar in a small pot and bring to a simmer.
2. Simmer for 10 minutes, stirring occasionally. Drain, discarding excess liquid, and return veggies to the pot.
3. Add remaining apple cider vinegar, sugar, and the spices and simmer for 5 minutes. Remove from heat, let cool, then chill until ready to use. (Makes about 2 cups)
4. Grill the Smart Dogs® for 2 minutes per side or until lightly charred. Assemble dogs with the toppings.