I've been planning to brew a beer with spruce tips and did some research to decide how to go about doing it. The gold standard in spruce tip syrup making is half a glass jar of tightly packed fresh spruce tips with the top half of the jar full of white sugar. This goes on a south-facing window and the sun supposedly melts the sugar and as it runs down, it captures the taste and healthiness from the spruce tips better than any other method.
Looked up the melting temperature of pure white sugar: 160 °C. Got a bit doubtful of the aforementioned method (wife has also tried and failed). So my plan would be to pack the tips and sugar on top in a tall kettle and melt the sugar in the oven. Tips go in a mesh insert, so after the sugar has melted, I could pour hot water into the kettle, dissolve the sugar in the water and lift out the mesh insert with the tips.
Today was the time to act it out. Spruce tips from the back yard, 1 kg of sugar. In the oven set at 160 °C, and yes indeed, sugar melts and the aroma from the spruce tips is amazing and appetising!
The beer has 4,75 kg of Viking Sahti malt mix, 1 kg Viking wheat malt, 1 kg Viking Munich Light and 250 g Simpsons Premium English Caramalt in a 19 liter mash. For hops I used Challenger from the start of the boil and some Simcoe for the last 20 minutes. It all came together to make a lovely pale brew.
The spruce component ended up as 2 litres of surprisingly dark green-brown liquid. I made sure all sugar was dissolved and dunked it into the fermenter first, followed by the wort. Both were filtered with reusable coffee filters.
My last doubt was that the spruce tips might contain stuff that would kill the yeast, so I made a starter with some of the spruce-sugar liquid. Sure enough, it got on bubbling like a champ!
That makes a great deal of sense. I'll certainly try to make an extraction with no heating next time. Shame that it'll have to wait a full year...