My trees' bounty of Thai limes (Citrus hystrix - also known as makrut, but please, not the k-word) made marmalade possible. It is delicious and set to perfection. Not everyone grows or has access to Thai limes and they do have a unique flavor and fragrance. But this recipe will work for other sour citrus. You can use any amount of fruit, as long as you stick to the formula. It's a lot of sugar in the finished marmalade but by no means overwhelming; the lime's pith is bitter and needs…