For the Meatballs:
1 tsp olive oil
1 medium onion, diced
1 garlic clove, minced
1 celery stalk, very finely diced
1/2 cup ground Simple Mills Fine Ground Sea Salt Almond Flour Crackers
1/4 cup parsley, chopped + more for serving
1 pound ground beef
1 egg
1/2 tsp all spice
Salt and pepper to taste
1/8 tsp cayenne powder (optional) 

For the Gravy:
2 cups beef stock, divided
1 tsp Dijon mustard
2 tbsp cream cheese
1 tbsp tapioca starch
Salt and pepper, to taste

Make the Meatballs: 
HEAT olive oil and add onions in a large deep sauté pan. Sauté on medium heat until the onions are translucent, about 5 minutes. 
ADD garlic and sauté for an additional 30 seconds.
DECREASE heat to low. 
ADD diced celery and cook until soft, about 5 minutes. Let cool for 5 minutes.
PREHEAT oven to 400ºF and line a baking sheet with parchment paper.
COMBINE ground crackers, parsley, ground beef, egg, all spice, salt, pepper and cayenne, if using, in a large mixing bowl. 
MIX until combined. 
ADD onion and celery mixture and mix once more. Set aside.
FORM 1-inch meatballs using your hands and arrange on the prepared baking sheet. 
BAKE for 25 minutes.

Make the Gravy: 
ADD beef stock, Dijon mustard and cream cheese in a blender. Blend until smooth.
TRANSFER to a medium saucepan. Bring to a boil. Once boiling, reduce heat to medium low and cook for 15 minutes to reduce.
ADD tapioca with ¼ cup of the sauce in a small bowl. 
WHISK until all lumps are eliminated. 
POUR into saucepan. Stir well.
SIMMER for another 5-8 minutes or until the sauce coats the back of a spoon, stirring occasionally.
SERVE with gravy and garnish with fresh parsley once meatballs are finished cooking.