Vegan Lemon Poppy Seed Cookies

• 1 Tablespoon ground flax seeds
• 1 Tablespoon cold water
• 200 g Dairy-free margarine use the soft spread rather than the block (¾ cup + 1 tablespoon)
• 150 g caster sugar (¾ cup)
• 100 g soft light brown sugar (½ cup)
• 1 Teaspoon lemon extract
• 320 g self-raising flour (2+½ cups)
• Zest of 1 lemon (make sure it's dry)
• 1 Tablespoon poppy seeds

Optional icing:

• 120 g icing sugar
• 2 Tablespoons fresh lemon juice