Pick one letter. Say its sound out loud, like “sss” for S. Then go outside and hunt for things that start with it: snails, sticks, stones, sand.
Bring a bag or a basket. Older kids find, younger ones carry. When you get home, line everything up on the table and say the sound together for each thing.
That is it. No worksheet needed. If you want one, the L is for Leaf page in the free pack is built for exactly this: trace, hunt, notice.
Tip: stop while it is still fun. A five-minute hunt that ends in giggles beats a long one that ends in tears.