Using a vegetable peeler remove peel from the small lemon trying to avoid the pith.
Using a knife cut into skinny strips (julienne). If you have trouble with this task you can just zest the peel from the lemon. Juice the other two lemons removing any seeds.
In a large saucepan combine peel, juice, water and baking soda.
Bring to boiling then reduce to a simmer. Simmer for 20 minutes. (If you are only using the zest, after the boil, continue to adding the strawberries. Do not simmer for 20 more minutes) Do not drain.
Stir in the crush (or diced fine) strawberries.
Return to a boil, and then reduce to simmer for 10 minutes. Add sugar and bring mixture to a full rolling boil, stirring constantly.
Add pectin, and return to a full rolling boil for 1 minute. Skim the foam if necessary.