4 ripe avocados
2 tbsp. lemon juice
1 (24 oz.) carton sour cream
1 pkg. dry taco seasoning mix
1 sm. onion, chopped
1 (8 oz.) pkg. shredded Cheddar cheese
4 sm. or 2 med. tomatoes, seeded and chopped
1 (6 oz.) can pitted black olives, minced

Peel avocados, remove pits and mash with lemon juice. Refrigerate until ready to use. Mix sour cream and taco seasoning mix.

Just before serving, spread avocado mixture 1/2 inch thick in the middle of a large platter (not silver). Spread sour cream mixture on top, leaving a ridge of green showing.

Layer chopped onions on top, then Cheddar cheese, tomatoes, black olives. Serve with tortilla chips.