- Use the chef's knife and cutting board to cut the watermelon into manageable chunks, looking for flesh that is bright red and moist; remove seeds if present. - 4 cups watermelon chunks 
- Place the watermelon chunks into the blender, adding lime juice, honey or agave syrup, and a pinch of salt. - 4 cups watermelon chunks 
- Blend on high until the mixture is smooth with small seed bits and pulp visibly dispersed throughout; about 30-45 seconds. Stop and scrape down the sides if needed. 
- Pour the blended mixture through a fine mesh strainer into a pitcher, using a spoon to press the pulp and extract liquid, leaving seed bits and pulp behind. Discard solids. 
- Pour the strained juice into glasses filled with ice, garnish with lime slices if desired, and add tequila if using. Serve immediately for a chilled, pulpy drink. - 4 cups watermelon chunks