By Zahna Eklund You’ll never have to endure dry salmon fillets again if you follow Mary Berry’s ultimate rule for ‘juicy’ results every time. Salmon is one of the most popular choices of fish when it comes to cooking, and it has a ton of health benefits too, from being an excellent source of vitamins and minerals like vitamin D, vitamin B12, Omega-3, and potassium, to promoting heart health and bone health. But cooking it correctly isn’t always easy, as salmon fillets are prone to drying out. According to TV chef and former Great British Bake Off judge Dame Mary Berry, however, there’s an easy…