Blat and Avocado Sandwich

Ingredients
1/2 small ripe avocado, peeled
2 tablespoons mayonnaise
1/2 teaspoon lemon juice
2 tablespoons crumbled Gorgonzola cheese
4 slices Italian bread, toasted
1-1/2 cups fresh baby spinach
4 tomato slices
4 thick-sliced applewood smoked bacon strips, cooked