Preparation Place beans in medium bowl. Mash with fork until almost smooth. Add sour cream, lemon juice, garlic, and cumin; blend well. Mix in onion and cilantro. Season dip with salt and pepper. Transfer to small bowl. Let stand at least 30 minutes to blend flavors. (Can be prepared 1 day ahead. Cover and refrigerate. Bring to room temperature before serving.) Place dip in center of platter. Surround with vegetables and pita triangles.
Preparation Place beans in medium bowl. Mash with fork until almost smooth. Add sour cream, lemon juice, garlic, and cumin; blend well. Mix in onion and cilantro. Season dip with salt and pepper. Transfer to small bowl. Let stand at least 30 minutes to blend flavors. (Can be prepared 1 day ahead. Cover and refrigerate. Bring to room temperature before serving.) Place dip in center of platter. Surround with vegetables and pita triangles.