Cheese and bacon hedgehog

Name: Cheese and bacon hedgehog
Prep time: 30 min
Cook time: 24 h 30 min
Total time: 25 h
Cuisine: European, British
Ingredients: 2 - 3 spring onions/shallots, trimmed and cut into pieces; 100 g bacon, cut into pieces (3-4 cm); 1 tbsp olive oil; 250 g cream cheese, cut into pieces (see Tips); 100 g mayonnaise; 1 tsp Worcestershire sauce; 1 pitted black olive, for decorating; rice crackers (see Tips)