1. Mash the bananas with butter to a pulp.
2. Whisk in the eggs, syrup, cinnamon, vanilla and bicarbonate of soda, lemon juice and salt.
3. Add the almonds and flax seed and mix well OR
4. Throw everything in a blender/food processor and blitz
5. Turn into the prepared loaf tin and level the top with a knife.
6. Bake 1-1 ½ hours until a skewer comes out clean. It may need covering with paper if it starts to look brown.
7. Leave to cool in the tin for a bit then turn out onto a wire rack

You could use muffin cases to shorten cooking time.