Prepare garlic chips by adding sliced garlic to a frying pan with oil. Cook over medium heat for 45-60 seconds per side until browned. Transfer to a drying rack once done cooking.
Combine ponzu with bonito flakes and let steep for 5 minutes. After steeping, strain out any excess liquid from the bonito flakes. If using hondashi, simply combine with the ponzu.
Pat the salmon sashimi dry with a paper towel. Slice into 1/4 inch thick pieces against the grain and arrange on a serving plate. Top each slice with fried garlic and chopped green onions. Keep chilled until ready to serve, and offer with ponzu dipping sauce.