Rosemary is growing abundantly in my southern California garden.
Rosemary has many health benefits, see references below for some of the science behind Rosemary and why it’s good for you.

If wild harvesting, choose a plant to use that is young and not in hot sun all day, as the leaves will be more fragment and it will not have the bitterness of older plants.

Ingredients
Rosemary leaves 1-2 tsp
1 cup water

Directions
Boil water, add rosemary and steep 10 minutes, then strain and serve.

You may add clove, honey or other ingredients as desired.

Resources

De Oliveira JR, Camargo SEA, de Oliveira LD, Rosemary officinalis L.(rosemary) as therapeutic and prophylactic agent, J Biomed SCI 2019;26:5
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6325740/