Add the flour, baking powder, baking soda, sugar, salt, and poppy seeds to a bowl, then grate in the zest of one lemon. Whisk to fully combine the dry ingredients.
Measure out a cup of the plant-based milk then add 1/4 cup of lemon juice - this is about one medium/large juicy lemon but you might need a second lemon if it's not quite a quarter cup. Mix the milk and lemon mixture, then let it sit for 5 minutes or so until good and curdled. Then add in the oil and whisk to fully combine (you don't want the oil sitting in a layer separate from the milk).
Pour the wet ingredients into the dry ingredients then stir to combine.
Preheat a non-stick fry pan on medium heat, and add about 1/2 tbsp of butter for every 2 pancakes you're cooking (i.e. if you have a frypan that will fit four pancakes, use 1 tbsp. If you have a frypan that will fit all 8 pancakes, use all 2 tbsp of the butter).
Once the butter is melted and starting to sizzle, add a hearty dollop of pancake batter. It won't spread much, but you can form it into a roughly circular shape with a spatula or spoon.
Cook cakes for 2-3 minutes per side, or until the base is a golden brown. If cooking in batches, place the finished pancakes on a baking tray in a warm but off oven.
Serve with maple syrup and lemon juice. Enjoy!