also cook black cap gills into paraffin, they're oily

df_trees/black_cap.lua

@@ -81,6 +81,15 @@ minetest.register_craft({
 	}
 })
 
+if minetest.get_modpath("basic_materials") then
+	minetest.register_craft({
+		type = "cooking",
+		output = "basic_materials:paraffin",
+		recipe = "df_trees:black_cap_gills",
+		cooktime = 5,
+	})
+end
+
 minetest.register_node("df_trees:black_cap_wood", {
 	description = S("Black Cap Planks"),
 	_doc_items_longdesc = df_trees.doc.black_cap_desc,

df_trees/depends.txt

@@ -3,4 +3,5 @@ intllib?
 doc?
 moreblocks?
 stairs?
-vessels?
+vessels?
+basic_materials?

df_trees/mod.conf

@@ -1,4 +1,4 @@
 name = df_trees
 description = Adds various types of underground fungal "trees". Light kills their saplings, they only grow in the dark.
 depends = default
-optional_depends = intllib, doc, moreblocks, stairs, vessels
+optional_depends = intllib, doc, moreblocks, stairs, vessels, basic_materials

oil/init.lua

@@ -206,6 +206,7 @@ if minetest.get_modpath("bucket") then
 			type = "cooking",
 			output = "basic_materials:paraffin",
 			recipe = "oil:oil_bucket",
+			cooktime = 5,
 			replacements = {{"oil:oil_bucket", "bucket:bucket_empty"}},
 		})
 	end