The first and most important thing you need to know is that you must decarboxylate your bud! You can't just mix ground product with butter. Yes, you can buy a fancy machine or follow the fine grind and mix approach and it will work. However, I have found that your finished product would be less than what you're after and the effect would be weak.
Decarboxylation is the chemical reaction that removes the Carboxyl group and activates your marijuana. This is the key to a good butter and good high.
1 cup Butter
1 cup Water
8 grams of Strain crossly ground
Place buds on parchment paper in 245-degree oven for 20 to 30 minutes to decarboxylate.
Once complete grind the buds to a coarse ground. There are two school of thoughts here fine vs coarse ground. I am a coarse fan for baking and a fine fan for sauces and chocolates. for baking, coarse ground will make it easy to removes bad plant material that can affect taste and texture.
Add 1 cup of water and one cup of butter to a saucepan and allow to melt and add ground product. Simmer at 160 degree for 3 hours. Strain out bad plant material and place butter in refrigerator to cool. If there is water remaining in jar, take butter out and drain water after one hour. Spread a bit on a Ritz to test and judge the dose.