Well a Hobbit Party, without Mushrooms is definitely NOT a Hobbit Party- so here's what I'm Bringing
Mushroom Tarts:

Mushroom (and Chicken) Pie

Po-Tay-Toe Salad

&
Some Homemade Lemonade

My Decorations are:
Freshly Picked Wild Flowers

&
Some Fairy Lights to make Mr Bilbo's Party Tree Twinkle
