Place chickpeas in blender or food processor with sun dried tomatoes, 2 Tbsp oil, lemon juice, tahini, garlic, and salt. Blend for 1-2 minutes. Scrape down sides and blend until combined. If the mixture is too thick, slowly add in some of the reserved liquid from the chickpeas until desired consistency (you can substitute water if desired). Garnish with fresh tomatoes and onions or chop the remaining sundried tomatoes for garnish.